Koi Betta Complete Care Guide 101: Look, Habitat, Diet 2024

By: Martin McAdam
Updated: February 19, 2023

Here, we will read know about the complete care guide for Koi Betta. Koi Betta is a beautiful and popular freshwater fish native to Thailand and can be found in slow-moving rivers and streams.

These fish are also known as the Butterfly Koi or Dragon carp. They are members of the Osphronemidae family, which contains other well-known freshwater fish, such as goldfish, carp, and minnows.

Koi Betta is a very hardy fish that can live in many water conditions.

Although they are not the easiest fish to care for, they can be a fun and rewarding addition to any aquarium with proper care and maintenance. They are known for being aggressive, but this only adds to their charms because they exhibit exciting behaviors.

There are wide different varieties of betta fish. They come in all shapes and colors. Koi Bettas are a type of marbled betta. Marbled bettas can be found in virtually any color combination, but Koi Bettas are bred to look like koi carp, commonly seen in garden ponds.

The water in their natural habitat is typically murky and contains a lot of vegetation. They are most often associated with Thailand but live in Cambodia, Laos, and Vietnam.

This article will cover everything you need to know about Koi Betta, including their natural habitat, diet, and care requirements.

Species Summary

Scientific NameBetta splendens
Common NamesKoi Betta, Marble Betta
Care LevelModerate
ColorRed, orange, black, and white
Lifespan2-3 years
Size3 inches
Minimum Tank Size10 gallons
Water Hardness:4-8 dGH
pH level:5.5-7.0
CompatibilitySmall peaceful fish

Koi Betta Appearance

All varieties of betta are beautiful. Koi Bettas are bred to look like the extremely popular koi carp. Lots of aquarium species have a koi variety.

They have a dark base color with lighter patches of color on their fins and bodies. The most common colors are red, orange, black, and white.

Koi Betta Appearance

Their bodies are elongated and compressed, with small heads and large eyes. They have two long dorsal fins and a shorter anal fin.

Their pectoral fins are long and thin, while their pelvic fins are shorter and thicker. A male Koi Betta is easy to identify. They tend to have brighter colors and more majestic fins than females.

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Koi Bettas are considered exotic because they are one of many specially bred varieties, making them rarer and, as a result, more expensive. If you want to purchase a Koi Betta, your best bet is to check with local fish stores or online retailers that specialize in selling Bettas—their price range between $25 to $50.

When buying your Koi Betta, observe it before taking it home. Check that its fins are not frayed or torn, and its body has no visible lesions. The betta should also be lively and responsive; if it appears sluggish, it may be sick.

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Some online retailers that sell Koi Bettas are:

  • Bettas4all
  • AquaBid
  • LiveAquaria

Koi Betta Size and Growth Rate

Koi Bettas typically grow about 3 inches long, although some individuals may grow slightly more prominent. Their short fins mean that you do not need extra space for them.

Koi Betta Size and Growth Rate

Females are usually smaller than males and have shorter fins. The growth rate of Koi Bettas is relatively fast; they can reach their full size within 6 to 8 months.

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Koi Betta Lifespan

The lifespan is about 3 years, although some individuals may live longer. Your Koi Betta can enjoy a long and healthy life with proper care.

Koi Betta Breeding

Koi Bettas are difficult to breed in captivity. They are mouthbrooders, meaning the female will carry the eggs in her mouth until they hatch. The fry is then released into the water, where they must fend for themselves.

It is best to keep a group to increase the chances of breeding. The ratio of males to females should be 1:2. The male will then choose a mate, and the two will spawn.

The female will lay up to 1000 eggs, which she will then pick up in her mouth. The eggs will hatch in about 24 hours, and the fry will be released into the water.

The fry is tiny and can be challenging to care for. They must be fed live food, such as baby brine shrimp or daphnia. Providing plenty of hiding places is also essential, as they are susceptible to predation.

It can be difficult to breed in captivity, but it is possible with the right conditions and care.

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Koi Betta Behavior and Temperament

These fishes are aggressive and are not recommended for community tanks. They are territorial and will often fight with other fish, even those of their species. Keeping them in single-species tanks or with other aggressive fish is best.

They are active fish and will swim throughout the tank. They prefer plenty of hiding places, such as caves and plants.

These fishes are not suitable for beginner aquarists. They require special care and attention, and their aggressive nature can make them difficult to care for.

Complete Care Guide For Koi Betta

Koi Bettas are hardy fish that can live in a wide range of water conditions, but they prefer slightly acidic to neutral water with a temperature between 75° to 84°Fahrenheit. They are not very picky eaters, but their diet should be varied and include both live and frozen foods.

Wipe away excess algae and perform weekly water changes. Use a water testing kit to check that the parameters are correct before you do this each time.

Since these fish are known to fight, they can easily pick up an injury. This could affect their behavior or make them more vulnerable to disease. Be sure to keep an eye on them and provide them with the best possible care.

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Koi Betta Food and Diet

Koi Bettas are omnivorous, meaning they will eat plants and animals. Their diet comprises small insects, crustaceans, and zooplankton in the wild. In captivity, they can be fed various foods, including live food, frozen food, pellets, flakes, and vegetables.

Live food, such as bloodworms, brine shrimp, and daphnia, should be offered sparingly, as it can cause digestive issues if fed too often. Frozen food, such as mysis shrimp and krill, is a great alternative to live food and is less likely to cause digestive issues.

Koi Betta Food and Diet

Pellets and flakes are a convenient way to provide with a well-rounded diet. Be sure to select a quality food that contains all the nutrients needs.

Vegetables, such as blanched zucchini, spinach, and peas, are a great source of vitamins and minerals. Koi Bettas love vegetables and often nibble on them when added to the aquarium.

Koi Betta Tank Size

The minimum tank size is 10 gallons. However, they do best in larger tanks, so if you can provide them with more space, they will be happier and healthier. A 20-gallon tank is a good size for a group.

Koi Betta Water Parameters

Koi Bettas prefer slightly acidic to neutral water with a temperature between 74 and 82 degrees Fahrenheit. Following are some water conditions that are suitable for Koi Bettas:

  • pH level: 5.5 to 7.0
  • Water hardness: 4 to 8 dKH
  • Temperature: 75° to 84°Fahrenheit
  • Ammonia: 0 ppm
  • Nitrite: 0 ppm
  • Nitrate: 20-40 ppm

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Koi Betta Filtration

Koi Bettas do not produce much waste, so a simple filter should be sufficient. Be sure to clean the filter regularly to prevent ammonia and nitrite build-up. Make sure the outlet isn’t too strong. Bettas naturally live in near-stagnant conditions.

Following are some recommended filters for Koi Bettas:

  • Aqueon QuietFlow 10 Aquarium Power Filter
  • Fluval AquaClear Power Filter
  • Marineland Penguin Bio-Wheel Power Filter

Koi Betta Heating

Koi Bettas prefer water that is between 75° to 84°Fahrenheit. If your home is fantastic, you must provide a heater to maintain these temperatures.

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Following are some recommended heaters for Koi Bettas:

  • Aqueon Pro Submersible Aquarium Heater
  • Fluval E Series Heater
  • Hydor ETH Inline External Aquarium Heater

Koi Betta Lighting

Koi Bettas do not require special lighting but prefer dimmer conditions. A fluorescent aquarium hood with a daylight bulb will give them the needed light.

Following are some recommended lights for Koi Bettas:

  • Zoo Med Aqua Sun Aquarium Hood
  • Marineland Double Bright LED Light Fixture

Koi Betta Substrate

Koi Bettas prefer a sandy substrate so they can burrow and build nests. They also like to have plenty of hiding places, so be sure to provide them with rocks, driftwood, and plants.

Following are some recommended substrates for Koi Bettas:

  • CaribSea Eco-Complete Planted Black Aquarium Substrate
  • Fluval Plant and Shrimp Stratum


Koi Bettas are not picky eaters, but they do prefer live food. Avoid plants with sharp leaves, as these can damage their fins. Be sure to include a variety of plants in their diet, such as algae, brine shrimp, bloodworms, and daphnia.

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Some recommended plants for Koi Bettas include:

  • Anacharis
  • Hornwort
  • Java moss
  • Water sprite
  • Java fern
  • Anubias
  • Hornwort


Koi Bettas do not require much in the way of decoration, but they do prefer hiding places. Be sure to include some rocks, caves, or plants in their tank for them to hide in. A group of Koi Bettas will also need more hiding places than a single fish.

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Following are some recommended decorations for Koi Bettas:

  • Zoo Med Betta Bed Leaf Hammock
  • Penn Plax Stone Replica Aquarium Decorations
  • Marina Naturals Rock Outcropping

Koi Betta Water Changes

Koi Bettas are not particularly sensitive to water quality, but it is still essential to perform regular water changes. A weekly water change of 10-15% is sufficient. Be sure to vacuum the gravel and clean the filter during each water change.

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Following are some recommended products for water changes:

  • Python No Spill Clean and Fill Aquarium Maintenance System
  • Aqueon Aquarium Water Changer
  • Fluval Edge Gravel Vacuum Cleaner


Ornaments are a fun way to add flair to your Koi Betta's home. Plants, driftwood, and rocks can all be used to create a more natural-looking environment for your fish.

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The following are recommended ornaments for your Koi Betta:


Rocks and Driftwood

You can use either real or fake rocks and driftwood in your aquarium. Be sure to clean any rocks or driftwood before putting them in the tank. To clean natural stones, soak them in a 10% bleach solution for 30 minutes. Rinse the rocks well before adding them to the tank.

To clean fake rocks, soak them in hot water for 30 minutes. Rinse the rocks well before adding them to the tank.

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Floating Plants

Floating plants are a great way to provide shelter for your Koi Betta. They also help to reduce stress and aggression levels in the fish.

Some good floating plants for Koi Bettas include:

  • Water Lettuce
  • Duckweed
  • Frogbit
  • Salvinia
  • Azolla

Cleaning the tank

You should perform a partial water change of 25% every other week. You will also need to vacuum the gravel and clean the filter media. Rinse the filter media in old tank water to prevent disrupting the beneficial bacteria colony.

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To clean the tank, you will need the following:

  • A sponge: A sponge can be used to wipe down the inside of the tank.
  • A toothbrush: A toothbrush can be used to clean the filter.
  • Freshwater: You will need fresh water to rinse off the sponge and toothbrush.

The steps for cleaning the tank are as follows:

  • Remove the fish from the tank and put them in a temporary home.
  • Remove all of the decorations from the tank.
  • Use the sponge to wipe down the inside of the tank.
  • Rinse the sponge and toothbrush with fresh water.
  • Use the toothbrush to clean the filter.
  • Rinse the sponge and toothbrush with fresh water.
  • Add the decorations back to the tank.
  • Add the fish back to the tank.

It is essential to clean the tank regularly to prevent the build-up of algae and bacteria. Algae and bacteria can be harmful to fish, and they can also cause the water to become cloudy.

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Cleaning The Filter

It is essential to clean your filter regularly. A dirty filter can cause problems for your fish.

To clean your filter, you will need the following:

  • A clean bucket: This is used to hold the old water.
  • A garden hose: This is used to rinse the filter media.
  • Filter media: This is used to replace the old media.

To start, you will need to remove the filter from your tank. Then, use the clean bucket to hold the old water. Next, use the garden hose to rinse the filter media. Finally, replace the old media with new media.

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Koi Betta Common Possible Diseases

Koi Bettas are often affected by several common diseases. Some of the most common include:

  • Fungal infections: These can affect the skin and fins and cause discoloration. Dirty water or poor water quality often causes them.
  • Bacterial infections: These can affect the skin, fins, and gills and cause redness, swelling, and ulcers. Dirty water or poor water quality often causes them.
  • Parasitic infections: These can affect the skin, fins, gills, and eyes and cause itching, irritation, and damage to the tissue. They are often caused by contact with infected fish or contaminated water.
  • Viral infections can affect the entire fish and cause wasting, discoloration, and death. They are often fatal, and there is no known cure.

Maintaining clean water and good water quality is essential to prevent diseases in Koi Bettas. Regular water changes and a filter will help keep the water clean and toxins-free.

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Koi Betta Preventions and Medications for these diseases

The best way to prevent infections in Koi Bettas is to maintain clean water and good water quality. Regular water changes and a filter will help keep the water clean and toxins-free.

It would be best to quarantine new fish before adding them to your tank. This will help to prevent the spread of disease.

If you notice any signs of disease, you should isolate the affected fish and contact a veterinarian. Early diagnosis and treatment are essential for the health of your fish.

The following are some medications that can be used to treat common diseases in Koi Bettas:

  • Fungal infections: Antifungal medications can treat fungal infections such as ketoconazole or fluconazole.
  • Bacterial infections: Antibacterial medications, such as erythromycin or tetracycline, can treat bacterial infections.
  • Parasitic infections: Antiparasitic medications like metronidazole or praziquantel can treat parasitic infections.
  • Viral infections: There is no known cure for viral infections—however, antiviral medications, such as acyclovir or valacyclovir.

It is essential to contact a veterinarian if you suspect that your fish has a disease. A professional can properly diagnose and treat the condition.

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Koi Betta Tank Mates

Koi Bettas are not recommended for community tanks. They are aggressive and territorial and will often fight with other fish. Keeping them in single-species tanks or with other aggressive fish is best.

Some compatible tank mates for Koi Bettas include:

Advantages Of Having Koi Betta In Your Tank

The following are the advantages of having Koi Betta in your tank:

  • Koi Bettas are beautiful fish that come in a variety of colors and patterns.
  • They are active fish that add movement and interest to the aquarium.
  • They are relatively easy to care for as long as their basic needs are met.

Disadvantages Of Having Koi Betta In Your Tank

The following are the disadvantages of having Koi Betta in your tank:

  • They are aggressive fish that can be difficult to care for.
  • They are not recommended for community tanks.
  • They require special care and attention.
  • They need a well-equipped aquarium and may not do well in community tanks.

Koi Bettas are difficult to breed in captivity, and their fry can be challenging to care for.

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Koi Bettas are a beautiful and popular type of fish that make great pets. They are relatively easy to care for and can live in various environments.

It depends on what aquarium you have and what other fish you have. If you have a community tank, it is best to avoid Koi Bettas as they are aggressive fish that can be difficult to care for.

However, if you have a well-equipped aquarium and are willing to provide the special care and attention these fish require, they can make a beautiful and exciting addition to your tank.

If you're thinking about adding a Koi Betta to your home, research and provide them with everything they need to thrive. Your Koi Betta can bring you years of enjoyment with the proper care.

Overall, Koi Bettas are an excellent choice for anyone looking for a new pet fish. Thanks for reading!


AquaMarinePower.com does not intend to provide veterinary advice. We go to great lengths to help users better understand their aquatic friends. However, the content on this blog is not a substitute for veterinary guidance. For more information, please read our disclaimer.

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