May 22

Sarah Robertson

How to Choose the Right Koi Guppy for Your Tank

Guppies are trendy freshwater fish for home aquariums. They don't require a lot of care, making them perfect for beginner fish keepers. Guppies also have beauty and variety working in their favor with colors and patterns that stand out — like the koi guppy fish.

The Koi Guppy is one of several distinct species of Poecilia reticulata guppy. They are a type of fancy guppy that have been selectively bred to have beautiful, ornamental color patterns. They are named after the Japanese koi fish, which they resemble. Koi guppy fish comes in a number of colors including white, black, blue, yellow, and red.

In this article, we will discuss everything you need to know about koi guppies including their care, diet, and tank mates. By the end, you will be an expert on keeping these beautiful fish in your home aquarium.

A Quick Koi Guppy Fish Care Guide

  • Scientific Name: Poecilia Reticulata
  • Common Name: Koi Guppy
  • Diet: Omnivores
  • Care Level: Easy
  • Compatibility: Peaceful
  • Ph: 6.0 to 8.0
  • Temperature: 72 – 80 degrees Fahrenheit
  • Water hardness: 8-12 dGH
  • Minimum Tank Size: 5 gallons for a group
  • Tankmates: Mollies, Platies, Swordtails, Endler's livebearers, Girardinus species, Heter
  • Breeding: Livebearers
  • Gestation period: 26-31 days
  • Size: 2.5 inches
  • Life expectancy: 2 years

Koi Guppy Care

Koi guppies are a popular choice among aquarium owners. They make a lovely addition to any aquarium and enjoy the company of peaceful tankmates. These guppies are recognized for their beautiful hues and long fins, similar to those of Japanese koi fish. However, unlike the regular Japanese koi fish, these fish species are relatively easy to care for and can be maintained in a small house aquarium.

When it comes to koi guppy care, one of the most important things to keep in mind is water quality. Koi guppies are native to South America. Generally, in the wild, they reside near areas with little to no movement such as ponds, swamps, and streams. To have these fish perform at their best potential in aquariums it is key to replicate their natural living space as much as possible.

For example, your tank should contain a sandy substrate along with an abundance of plants for the fish to hide amongst. The quality of the water is an important factor to keep these fish lively. The water should be clean and free of ammonia in order for them to thrive. To maintain the aquarium clean, test the water on a regular basis and perform periodic water exchanges. 

Another important aspect of koi guppy care is feeding them. These fish are omnivores that consume live food, frozen food, and flake food in the wild. There are a variety of commercially prepared foods available if you keep them in captivity. It's critical to make sure they're getting enough protein through their diet, though.

Keep reading to learn everything you need to know about taking care of koi guppies, from setting up their tank to choosing the right diet and compatible tank mates.

Koi Guppy Size

Guppy size averages 2.5 inches, but with the right environment and care, they can grow to be three inches long. Guppies that are small usually have poor nutrition or come from inbreeding. To make sure your guppies stay healthy and large, pay attention to their diet and living conditions. Check the water quality often and give them a varied diet of high-quality food pellets or flakes.

Koi Guppy Lifespan

The usual koi guppy lifespan is two to three years, but they can live up to five years if properly cared for. Diet, water quality, and stress levels all influence how long your guppy lives. Providing a clean tank and lots of fresh food will aid your fish in living a long and healthy life.

koi guppy

Koi Guppy Appearance

Koi guppies are known for their beautiful colors and long fins. Just like the Japanese koi fish, they come in many different colors including black, blue, yellow, and red. These guppies have a reputation as being one of the most beautiful small freshwater aquarium fish. They are also very peaceful fish that get along well with other tank mates. Like any other guppy fish, the koi guppy has a torpedo-shaped body with a protruding mouth. Their fins are very bright, which makes them stand out amongst other fish in the aquarium. 

Variations of the Koi Guppy

Like the Japanese koi fish, koi guppies come in many different colors. There are even some that have two colors, such as black and white or red and blue. The most common varieties of koi guppies are mentioned below. Some common varieties of koi guppies are listed below:

Albino Koi Guppy

One of the one-of-a-kind Poecilia reticulate strains is the Albino Koi Guppy. After years of careful selection and breeding, it is a distinctive guppy variety with unusual and vibrant colors. The bright red coloration on the tail fin, dorsal fin, and face on a white body makes it appear quite appealing. Albino Koi Guppy got its name from its beautiful, pearlescent white body color.

Aside from being easy to take care of, this type of guppy is also a peaceful fish that doesn't need much maintenance. They quickly adapt to different water parameters and conditions, making them ideal for aquarium enthusiasts. When provided with the proper environment, Albino Koi Guppies thrive and live long lives.

Red And Black Koi Guppy

If you are looking for a fish that is both beautiful and unique, the Red and Black Koi Guppy is a perfect choice. As its name suggests, this type of guppy has a vibrant red coloration with black spots on its body and fins. The contrast between the two colors makes it stand out from other fish in the aquarium.

Red and Black Koi Guppies are also known to be hardy fish that can adapt to different water conditions. They are peaceful fish that get along well with other tank mates. When provided with the proper environment, Red and Black Koi Guppies thrive and live long lives. 

Galaxy Koi Guppy

The Galaxy Koi Guppy is a beautiful fish that has a pearlescent white body with black spots. It is a very popular fish amongst aquarium enthusiasts because of its unique coloration that appears to be out of this world. When provided with the proper environment, Galaxy Koi Guppies thrive and live long lives. 

Tuxedo Koi Guppy

Tuxedo Koi Guppy, also known by its scientific name Poecilia Reticulata, is a livebearer fish belonging to the family Poeciliidae. It has gained popularity among breeders for its distinctively charming orange and black coloring with dark blue highlights. Tuxedo Koi Guppy is perfect for beginners, professionals as well as experienced breeders alike because it was bred through selective breeding specifically for those groups of people.

Gender Differences

Differentiating the male from the female koi guppy can be difficult for beginners. However, there are some physical differences that can help you determine the gender of your fish. 

  • Colors: Male Guppies are much more colorful than females since they use their vivid color to attract a mate. A Female’s body is usually pale gray or silver bodies whereas a male’s body is colorful with different patterns. Some females do have a bit more color, however, if you compare the male and female Guppies from the same spawn, you’ll realize how much more colorful the males are.
  • Tails: Males have big and colorful tails.
  • Anal Fin: The male’s anal fin differs in shape. A male’s anal fin is usually long and pointed. A Female’s anal fin is triangular in shape. The anal fin is the fin just below a Guppy’s tail fin.

Tips to Choose the Right Koi Guppy for Your Tank 

Selecting the perfect koi guppy fish for your tank can be a daunting task, especially with all of the different colors and patterns to choose from. Here are a few tips on how to pick the best fish for your aquarium:

Tank Size

Consider the size of your tank when selecting your fish. This is the first and most important factor to take into account. Guppies reach a  maximum size of three inches, so a small tank is adequate for a group of these fish. However, if you are planning to put other fish in the tank with your guppies, be sure to research their size and compatibility before making your purchase.

Koi Varieties

Do some research on the different types of koi guppies. There are many different colors and patterns to choose from, so find one that you think would look nice in your aquarium. Choose a color that compliments the other fish in your tank. You don't want your koi guppy to be too camouflaged or stick out like a sore thumb. Many pet stores will have pictures of different koi guppy varieties so you can compare and contrast them before making your purchase.


When selecting your koi guppies, be sure to choose fish that are compatible with each other. Different types of koi can get along, but it is important to do your research before adding them to your tank. Some koi are more aggressive than others and may not do well with peaceful fish like guppies. It is best to purchase all of your koi guppies at the same time so you can be sure they will get along.

Select from a Reputable Breeder

The first purchase should be from a reputable breeder or a trusted local fish pet shop - a reputable fish pet store will always keep their aquarium fish tank very clean and the fish should appear active and healthy.

Before making a nipple chase, it is a good idea to make sure that the store is taking good care of the fish and acquiring tanks. Otherwise, you might be bringing unwanted parasites and bacteria into your home-acquired tank.

Look at all the tanks for signs of dirtiness. If there is a film of algae on the aquarium tank walls, then you need to shop elsewhere. When you plan to purchase online, you should ask the sealer to take a video of the guppies in the tank or take pictures if any of the fish and the store appear to be lifeless or unhealthy, then do not purchase any fish from that store.


Compare the coloring of your koi guppy to other fish in the tank. A healthy male should be brightly colored, and females should have uniform coloring with males. "Naughty" or unhealthy guppies may have dark patches on their scales or frayed fins. This is a good way to identify a guppy that is likely to get sick in the future. Also, make sure that there are no visible injuries on any of the fish in the tank, as this could indicate that the store does not properly care for its animals.

Males will be much more brightly colored than females, often with iridescent colors on their fins and tails. Females tend to be a duller color, with fewer markings. It is also important to check the size of the fish. A healthy guppy should be about 2.5 centimeters (1 inch) long, not including the tail. 

Check Signs of Disease

Guppies are especially susceptible to stress-induced diseases, like white spots, fin and tail rot, and velvet, but one koi guppy disease, in particular, is bolis (aka "culinary's" or "mountain fungus"). Other signs of the disease to look for include dropsy (swelling), swollen wheels, and gasping swim bladder disorder.  Also, it is very important to look for bill worms, fish tuberculosis, and angleworm. 

Another indication that your guppy is in excellent health is the smooth scales and rounded fins. If you detect any bumps or projections, the fish is most likely sick. Healthy fins will be unclamped, clear, and free of white spots or fingers. This is a good way to tell if a koi guppy is unhealthy, as sick fish often have clamped fins and white spots on their bodies. When guppies' fins begin to rot or fall off as a sign of disease, it's an indication they're not happy. 

The body of a healthy, happy, and well-functioning fish should not be bloated or have scales protruding from its body. The skin on healthy fish will be blemish-free and scales will lie flat against the body. 

Make certain to examine the fish carefully. Select fish that are lively and active; they should not be lying on the surface or hanging around at the bar of the tank unless it's a fish that likes to swim at the bottom. Examine their bodies, skin fins, eyes, and ears for signs of illness or damage.   

A good rule of thumb is to purchase guppies that are at least 3/4ths the size of your pinky finger. Smaller fish that are not fully developed could be more susceptible to disease. Also, avoid purchasing a koi guppy that is much larger than the others in the tank as this could lead to aggression issues.

Koi Guppy Behavior

Koi guppies are relatively peaceful fish that do well in community tanks. They are not known to be aggressive toward other fish, but the males can be aggressive toward each other. If you have a male and female koi guppy, they will likely get along well.

Koi Guppies are known to be active swimmers and they prefer to be in schools. In the wild, these fish live in slow-moving waters in South America.

In captivity, koi guppies do well in tanks with plenty of plants and hiding spots. They also prefer tanks with a lot of open space to swim.

koi guppy

Koi Guppy Tank Setup

Setting up a tank for koi guppies is not difficult. These fish are not picky eaters and they do well in a variety of water conditions. However, like any other fish, they need a clean and well-maintained tank to stay healthy.

Here are some tips for setting up a koi guppy tank:

Tank Size

The minimum tank size for koi guppies is 5 gallons. However, if you want to keep more than a few fish, you will need a larger tank. There are many benefits to a larger tank, including more space for the fish to swim and very few water quality issues.

If you want to add diverse fish to your aquarium, keep in mind their size and requirements while choosing a tank size.

Water Conditions

Koi guppies are not picky about water parameters. They can live in a wide pH range and a wide temperature range. However, they prefer neutral water with a pH of 6.5 to 8.0. The temperature of the water should be between 72 and 82 degrees Fahrenheit.

Be sure that your water is safe for fish by checking the levels of chlorine, ammonia, and nitrites. You can use a water conditioner to remove harmful chemicals from the water. The nitrates and phosphate levels should also be monitored, as too much of either can cause algae problems.


Koi guppies do not produce a lot of waste, so a simple filter is all that is needed to keep the water clean. A hang-on-back filter or a canister filter will work well for a koi guppy tank. Be sure to choose a filter that is rated for at least twice the size of your tank.

If you have a lot of plants in your aquarium, you may not need a filter at all. Plants help to keep the water clean by absorbing nitrates and other pollutants.


Koi guppies do not need special decorations, but if you want to make your aquarium more attractive, there are many options available.

Driftwood and rocks

These fishes like to hide when they are feeling stressed, so having some driftwood or rocks in your aquarium will give them a place to hide. Also adding this driftwood and stones to your aquarium might give it a more natural appearance. Make sure the pieces you pick are suitable for aquariums and won't affect the water quality. Touch it and make sure there aren't any sharp or jagged edges that could harm your fish. Before adding it to your tank, clean it thoroughly.


Koi guppies do not need live plants, but they do benefit from them. Plants help to keep the water clean and provide hiding spots for the fish. Live plants also add oxygen to the water.

Some good plant choices for koi guppy tanks include:

  • Java moss
  • Hornwort
  • Anacharis
  • Water sprite
  • Ludwigia

If you can't find these plants in your area, you can also add artificial plants to your tank. Be sure to choose plants that are safe for fish and made from non-toxic materials. Wash them well before adding them to the tank.


Koi guppies do not need a special substrate, but they do need some type of substrate to anchor their plants. A gravel substrate is a good choice for koi guppy tanks. Be sure to choose a substrate that is small enough so that the fish cannot swallow it.

In case you are planning to keep live plants in your aquarium, you will need to add a nutrient-rich substrate. A good choice for live plants is an aquarium soil substrate.


Koi guppies do not need special lighting, but they do benefit from some type of light. Live plants will do best with a full spectrum LED light. This type of light promotes plant growth and also enhances the colors of the fish.

If you are not planning to add live plants to your tank, you can choose any type of light that you like. Koi LED lights are a good choice for koi guppy tanks.

Koi Guppy Tank Mates

Koi guppies are peaceful fish, so they can be kept with a wide variety of tank mates. Some good choices for koi guppy tank mates include:

  • Neon tetras
  • Guppies
  • Platies
  • Swordtails
  • Mollies
  • Danios
  • Barbs
  • Corydoras catfish

Do not keep koi guppies with fish that are known to be aggressive or nippy. These fish will stress the koi guppies and may even cause them to die. Some bad choices for koi guppy tank mates include:

  • Betta fish
  • Goldfish
  • Sharks

If you are adding koi guppies to an existing aquarium, be sure to choose tank mates that are compatible with them in terms of water parameters.

Note: Observe your fish closely when you first add them to the tank. Some fish may appear to be peaceful at first, but they may become aggressive as they grow larger. In case of any aggression, remove the aggressor immediately.

Tank Maintenance

Koi guppies are easy to care for, but they do require some basic tank maintenance.

  • Be sure to do a partial water change at least once a week. This will help to keep the water clean and remove any toxins that may have accumulated in the tank. To do a partial water change, remove 10-15% of the water from the tank and replace it with fresh, clean water.
  • Clean the filter regularly. This will help to remove any debris or waste that has accumulated in the filter media. Most filters will need to be cleaned every 2-4 weeks.
  • Be sure to vacuum the gravel and clean any algae that have accumulated on the glass. This will help to keep the tank looking clean and prevent the build-up of toxins.

Note: While changing the water, make sure to use a water conditioner to remove any chlorine or other chemicals that may be present in the tap water. If you do not have a water conditioner, you can use aged water that has been left out for 24 hours.

koi guppy

Koi Guppy Diet 

Koi guppies are not picky eaters and will accept most types of fish food. Flakes, pellets, frozen, and live food.

To keep your koi guppies healthy, it is important to feed them a varied diet. They should be fed several times a day, but only as much as they can eat in 2-3 minutes.

Here are some good food choices for koi guppies:

  • Flakes or pellets: Koi guppies will accept most types of fish food, but they should be given a high-quality diet of flakes or pellets. Read the ingredient label to make sure the food you are choosing is high in protein and does not contain fillers or artificial colors.
  • Live food: Live food is a great way to add variety to your koi guppy's diet. Live food contains more nutrients than pellets or flakes and will help keep your fish healthy. Some good choices for live food include brine shrimp, daphnia, and blackworms.
  • Frozen food: Frozen food is a good alternative to live food. It is more convenient and easier to store than live food. Be sure to thaw the food before feeding it to your fish.
  • Vegetables: Koi guppies also like to eat vegetables. You can offer them blanched spinach, zucchini, and peas. Be sure to remove any uneaten vegetables from the tank so they don't decompose and pollute the water.

What Not to Feed

There are a few things you should avoid feeding your koi guppies:

  • Foods high in fat: Foods that are high in fat can cause obesity and health problems in fish. Avoid feeding your koi guppies food that is high in fat, such as fried foods or processed foods.
  • Foods high in salt: Salt can be harmful to fish if they are exposed to too much of it. Avoid feeding your koi guppies food that is high in salt, such as chips or pretzels.
  • Mealworms: Mealworms are high in chitin, which can be harmful to fish if they eat too much of it. Chitin is a substance that is found in the exoskeletons of insects. It is not digestible by fish and can cause health problems if they eat too much of it.

Feeding Tips

Here are a few tips to help you with feeding your koi guppies:

  • Offer a variety of foods to keep your fish healthy.
  • Feed your fish several times a day, but only as much as they can eat in 2-3 minutes.
  • Remove any uneaten food from the tank so it does not decompose and pollute the water.
  • Use high-quality fish food to ensure your fish are getting the nutrients they need. Water Quality.

Koi Guppies Diseases

Guppies are generally quite hardy fish and don't get sick often. However, there are a few diseases that they are susceptible to, so it's important to be aware of them.

Some common diseases that affect Koi guppies include:

  • Ich: The most common problem in the fishkeeping hobby is white spot diseases, which are known as white spot ailments. If Ich is treated promptly, it is not deadly. Ich is caused by an ectoparasite (ciliate protozoan Ichthyophthirius multifiliis) and is easy to see. The fish begin to rub their skin against rocks, plant leaves, decorations, or the aquarium's sides. They may also lose their appetite. You will see tiny white spots on the skin and fins of your fish. It is not difficult to cure ich. There are a variety of medications available; however, you can also use aquarium salt.
  • Velvet: Velvet is a type of parasite that affects the skin and gills of fish. It is often confused with ich, but there are some key differences. Velvet is more difficult to see and usually only affects one side of the fish. The affected fish may also have trouble breathing and will often hide. If velvet is left untreated, it can be deadly. There are a variety of medications available to treat velvet, but the best way to prevent it is to quarantine new fish before adding them to your tank.
  • Fin rot: Fin rot is a bacterial infection that affects the fins of fish. It is often caused by poor water quality or injuries. The affected fish will often have ragged or torn fins. If fin rot is left untreated, it can be deadly. There are a variety of medications available to treat fin rot, but the best way to prevent it is to maintain good water quality and avoid injuries.
  • Protozoan: Protozoa is a tiny worm that primarily affects guppies. Other fish may be harmed as well, but guppies are the most frequent victims of this illness. The parasite attaches itself to the fish's skin and slowly crawls into its body via its muscle until it reaches circulation. Protozoal infections are generally seen in unheated tanks accompanied by poor water quality.
  • Columnaris: Although it appears to be a fungus, this illness is caused by bacteria. The colony of germs typically grows on the fish's mouth or middle third of the body as a large white splodge. Because the disease slowly paralyzes the muscle, sick fish have difficulty swimming. They also lose their appetite. The bacteria is highly contagious and mostly affects female guppies, but male guppies can also be infected if the illness is not treated. It can wipe out the whole fish colony in a tank.
  • Dropsy: Dropsy is an inflammatory disease of the liver or kidney that causes the abdomen to be filled with fluid it cannot expel. The fish becomes swollen, discolored, and occasionally deformed, with scales looking like pine cones protruding from its body. If a fish's belly becomes bloated, it could have trouble swimming. A bloating belly can also come from an excess of fluid in the colonic cavity. This might be due to water pollution, genetic disorder, or feeding habits. Overfeeding on blood worms or having long-term high stress could lead to dropsy.
  • Red Blood Paralysis: Also known as red body disease, this is a condition that affects fish in brackish and saltwater aquariums. The cause of the disease is unknown, but it is believed to be a viral or bacterial infection. The affected fish will have red patches on its body and may eventually become paralyzed. There is no known cure for this disease.
  • Viral Haemorrhagic Septicaemia: The guppy fish is infected with a virus that causes viral hemorrhagic septicemia (VHS). Lesions on the body are the first symptoms of viral hemorrhagic septicemia. Ulcers and sores will emerge later, as well as decaying fins. Pale gills and protruding eyes might be indicators of VHS. The fish will eventually cease eating and become less vibrant in color. You can treat your fish with antibiotics such as Maracyn 2 and API Furan 2 to cure VHS.
  • Popped eye: As the name suggests, popped eye is when the fish's eyes bulge out of its socket. It can be caused by a variety of things, including injuries, tumors, and infections. If the cause is an infection, it is often accompanied by other symptoms such as cloudy eyes, ulcers, and sores. Without knowing the root of the problem, it is very difficult to administer a cure. Different treatments might do more harm than good if you're not careful.


If your fish is displaying any of the following symptoms, it may be sick:

Loss of appetite

Rubbing against objects in the tank

White spots on skin or fins

Redness or inflammation

Ragged or torn fins

Difficulty breathing


Bloated abdomen

Pinecone-like scales


If you notice any of these symptoms, it is important to take action immediately. The sooner you identify the problem, the easier it will be to treat.


Preventing illness in your fish is always easier than treating it. Here are some tips to help you keep your fish healthy:

Quarantine new fish before adding them to your tank

Maintain good water quality

Avoid injuries

Feed a varied diet

Remove sick fish from the tank immediately

Avoid overcrowding

Check fish for parasites before buying them

Add live plants


The best way to prevent your fish from getting sick is to maintain a clean and healthy aquarium. However, if your fish does become sick, there are a variety of treatments available.

Aquarium salt: Aquarium salt is a natural remedy that can be used to treat a variety of illnesses, including ich and velvet. Simply add 1 tablespoon of salt per gallon of water. The salt will kill the parasites and help to heal the fish.

Medications: There are a variety of medications available to treat fish illnesses. Be sure to read the instructions carefully and follow them exactly. Overdosing your fish can be just as harmful as not treating them at all.

Quarantine: Quarantining new fish is the best way to prevent the spread of disease. Keep new fish in a separate tank for 2-4 weeks before adding them to your main tank. This will give you time to observe them for any signs of illness.

Water changes: Water changes are an important part of maintaining a healthy aquarium. Be sure to change 25-50% of the water every week. This will remove any toxins or parasites that may be present.

koi guppy

Koi Guppies Breeding

Koi guppies are one of the easiest fish to breed and are perfect for beginners. However, there are a few things to keep in mind if you want to breed Koi guppies successfully.

Here are some tips for breeding Koi guppies:

Select Healthy Fish

Select only those species that are compatible with one another and will be able to produce fry. Remember to consider the number of fish you wish to breed as well as each individual fish's unique color pattern and tail form. If you choose similar color patterns, their fry will almost certainly have the same design. Fin forms are also a factor to take into account.

Select Breeding Tanks 

A 10 to 20-gallon tank with a heater and mild filter is necessary. Some filters can be too powerful and draw the baby guppies in, causing them to die. If you're concerned about your filter's strength, cover the hole in the mesh with sheer tights-this will allow water to pass through while also protecting the fry from being sucked in.

Set up the Breeding Tank 

If you're raising male guppies, know that they may become cannibals, so their fry will need hiding places. Guppy fry usually sinks, so use plants that float low in the water. Keep in mind that healthy fry will rise up, so you'll also need a high cover. Lastly, the tank shouldn't have any substrate. . A clean bottom in a tank can aid fry development since it is easily cleaned and you may keep track of how many live fries or how much they eat.

Adjust the Tank for Your Fish's Specific Requirements

Set the temperature in the breeding tank to around 77-79 degrees Fahrenheit (25-26.11 C) while the females and males are together. To stimulate healthy reproduction, feed your guppies with high-nutrition food before putting them in the breeding tank.

Add the Guppies to the Breeding Tank

The only thing left to do now is wait for your fish to breed. If you see that your female fish has a gravid spot (a dark mark on her abdomen signifying pregnancy), put the male back in the regular tank. All female fish develop this when pregnant, but it's notably darker when eggs have been fertilized.

Know When Your Fish is About to Give Birth

The typical gestation period is 26 to 31 days, but there are some signs that your female guppy is almost ready to give birth: a large stomach, deep black gravid spot (or dark maroon if you are breeding albino or blond guppies), and her belly will start to look more like a box than round. Remember that guppies give birth to live young instead of eggs. Once your pregnant female fish has given birth, remove her from the tank immediately (otherwise she may eat her young.)

Koi Guppies Fry Care

After the female gives birth, you should start seeing fry within a few hours. The fry are born completely formed and capable of swimming but are quite small (approximately 1/8 inch or 3 mm). For the first couple of weeks, they will hide among plants in the tank and feed on microscopic organisms. Once they're around two weeks old though, you can begin feeding them baby brine shrimp or powdered fry food.

The fry will need to be transferred to a larger tank as they grow. They can be moved to a 10-gallon tank once they reach around 1/2 an inch (1.27 cm). You can start feeding them regular guppy food at this point too.

They should be the same size as their parents and ready to breed around 2-3 months old.

Frequent Questions

What is Koi guppy?

Koi guppy is a type of fish that is known for its bright colors and patterns. These fish are popular among aquarists and can be found in many pet stores. Just like the Japanese koi fish, koi guppies come in a variety of colors including orange, yellow, white, and black. These fish are usually between 2-3 inches in length and have a lifespan of 2-3 years. 

What do koi guppies eat?

Koi guppies are omnivores, which means they will eat both plant and animal matter. In the wild, koi guppies feed on algae, small insects, and crustaceans. In captivity, these fish can be fed a variety of foods including pellets, flakes, live food, and frozen food. It is important to offer your koi guppy a varied diet to ensure they are getting all the nutrients they need. 

How do koi guppies breed?

Koi guppies are live-bearing fish, which means they give birth to live young. The female koi guppy will store the sperm from the male in her body and use it to fertilize her eggs when she is ready to breed. Once the eggs are fertilized, the female will carry them for about 4-6 weeks before giving birth. After the fry is born, they are independent and will start to feed on their own. 

Can koi guppies breed with their siblings?

Yes, koi guppies can breed with their siblings. In fact, inbreeding is often done on purpose by aquarists to create fish with desired color patterns. However, inbreeding can also lead to health problems in fish so it is important to only breed fish that are healthy and free from genetic defects. 

How many koi guppies can I have in my tank?

The number of koi guppies you can have in your tank will depend on the size of your tank. As a general rule of thumb, you can have 1-2 koi guppies per gallon of water. So, for a 10-gallon tank, you could have 10-20 koi guppies. It is important to not overcrowd your tank as this can lead to stress and disease in your fish. 

Are koi guppies aggressive?

No, koi guppies are not aggressive fish. In fact, they are known for being peaceful and easy to care for. These fish get along well with other peaceful fish and can even be kept with smaller fish such as neon tetras. That being said, koi guppies may become aggressive toward each other if they are not given enough space. So, it is important to provide your koi guppies with plenty of hiding places and to not overcrowd your tank. 


Koi guppies are beautiful fish that are popular among aquarists. These fish come in a variety of colors and patterns and are relatively easy to care for. If you are considering adding Koi guppy to your tank, be sure to provide them with plenty of space and a varied diet.

A tank of at least 5 gallons is recommended for these fish if you are planning to keep them in a small group. If you want to keep them with other varieties of fish, then be sure to choose peaceful species that are similar in size. These fish are omnivorous and will eat both plant and animal matter. In the wild, they feed on algae, small insects, and crustaceans.

In captivity, you can feed them pellets, flakes, live food, and frozen food. It is important to offer your koi guppy a varied diet to ensure they are getting all the nutrients they need. These fish species are known lo have a lifespan of 2-3 years with proper care. They can reach a size of 2-3 inches when fully grown. So, if you are looking for a beautiful and low-maintenance fish to add to your tank, koi guppies might be a perfect choice!

Sarah Robertson

I am a passionate blogger who also happens to be a fish keeping enthusiast. Writing about my hobby is something that I absolutely love to do, and it's no secret that my chosen topic is always centered around fish keeping.

Sarah Robertson

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