Koi Betta Fish: A Care Guide To Help Them Thrive

Betta fish are a popular and beloved species in the aquarium hobby due to their striking colors, unique personalities, and ease of care. Koi bettas, a variation of the traditional Siamese fighting fish, have quickly become a favorite among betta enthusiasts because of their stunning, marble-like patterns resembling the Koi fish.

In this care guide, we will go over all the important aspects of providing a healthy and happy home for your Koi betta, including tank size, water parameters, diet, behavior and temperament, tank mates, and more.

Koi betta fish Species Summary

Koi betta fish are a variation of the popular Siamese fighting fish. These fish are known for their striking marble-like patterns, resembling those of the Koi fish. Koi bettas have become a popular aquarium species due to their unique appearance and easy care requirements.

They are hardy and can adapt to a variety of water conditions, making them an excellent choice for both beginner and experienced aquarists. Koi bettas are active and playful, and their distinct personality makes them a favorite among betta enthusiasts.


Koi betta fish are known for their striking appearance. Their colorful, marble-like patterns resemble those of the Koi fish, featuring a mix of white, black, orange, and red markings. Their fins are also distinctive, with long and flowing edges.

Koi bettas are typically smaller than other betta fish, reaching an average length of 2-3 inches. The females are generally smaller and have shorter fins than males. Overall, Koi bettas are a stunning addition to any aquarium due to their unique and vibrant appearance.

Koi betta fish Types

Koi betta fish come in a few different types, each with its own unique characteristics and appearance. The most common type is the galaxy koi betta, which features a combination of red, black, and white patches, as well as iridescent scales in deep blue and turquoise hues.

These blue spots create a galaxy-like appearance, hence the name. Another popular variant is the candy dragon koi betta, which displays a range of shades, including pink, red, purple, and blue.

Another type of koi betta is the plakat, which can have a variety of eye-catching colors, but their most defining feature is the shape of their fins. Like other plakat bettas, their fins are shorter and rounded, giving them a unique look.


Koi betta fish, like other Betta splendens, can live up to 3-5 years with proper care. However, their lifespan can be influenced by various factors such as genetics, environment, and diet. Providing a healthy and stress-free environment, feeding a balanced diet, and regular maintenance can help to ensure a longer lifespan for your Koi betta.

Koi betta Average Size

Koi betta fish are relatively small, with fully grown adults averaging between two and a half to three inches in length. Females are generally smaller than males and have shorter fins. Despite their small size, Koi bettas are active and playful, adding a lively and entertaining aspect to any aquarium.

Koi Betta Fish Care

Koi betta fish care involves ensuring a healthy and suitable environment, a balanced diet, and regular maintenance. Here are some important factors to consider when caring for Koi bettas:

Tank Size

The minimum tank size for a single Koi betta is 5 gallons. However, a 10-gallon tank or larger is recommended, especially if you plan on keeping more than one betta in the same tank. It’s important to provide enough swimming space and hiding places for your Koi betta.

What To Put In Their Tank

Water Parameters

Koi bettas prefer warm water temperatures between 76-82°F, and a pH level between 6.5 and 7.5. It’s important to monitor ammonia, nitrite, and nitrate levels in the tank and perform regular water changes to maintain a clean and healthy environment.

  • Water temperature: 75 to 84 degrees Fahrenheit
  • pH levels: 5.5 to 8.0 (Around 7.0 is ideal)
  • Water hardness: 4 to 8 dGH (Soft)

What to Put in their Tank

Koi bettas enjoy having plenty of hiding spots, so adding plants and decorations to the tank can provide a comfortable and stimulating environment. A filter and heater are also essential to ensure proper water quality and temperature.

Common Possible Diseases

Koi bettas are susceptible to various diseases, including fin rot, ich, and velvet. It’s important to observe your Koi betta regularly for any signs of illness and provide prompt treatment if necessary.

Food and Diet

Koi bettas are carnivorous and require a protein-rich diet. Offer a variety of high-quality betta pellets and occasional treats such as frozen or live food. Avoid overfeeding, as Koi bettas are prone to obesity and related health issues.

Behavior and Temperament

Koi bettas are generally active and playful, but can also be territorial and aggressive towards other fish. It’s important to provide enough space and hiding spots in the tank and avoid overcrowding. Observe your Koi betta’s behavior regularly to ensure they are not stressed or displaying signs of illness.

Tank Mates

Koi bettas are best kept alone or with peaceful fish such as snails or shrimp. Avoid keeping them with other bettas or fish with long, flowing fins, as Koi bettas may mistake them for rival males and attack them.

The best tank mates for koi bettas are non-territorial passive fish. Some good options include:

  • Ember Tetras
  • Kuhli Loaches
  • Bristlenose Plecos
  • Harlequin Rasboras
  • Cory Catfish
  • Clown Pleco
  • Amano Shrimp


Breeding Koi bettas requires careful preparation, including providing the right environment, conditioning the male and female, and managing the breeding process. It’s important to research and understand the breeding process thoroughly before attempting to breed Koi bettas.

Overall, Koi bettas are hardy and easy to care for, but providing a healthy and stimulating environment, a balanced diet, and regular maintenance is essential to ensure their longevity and happiness.

To breed Koi betta fish, set up a shallow tank with a divider, with the water only being five inches deep at most.

Condition the fish with high-protein foods and add the female to one side of the tank an hour before the male is added to the other side. Once the male builds a bubble nest, remove the divider to allow the fish to spawn.

Keep an eye on the pair during the spawning process and remove the female if she shows signs of distress.

Fungus can be a problem for the eggs, so consider using antifungal treatments. The male will watch over the eggs until they hatch in 24 to 48 hours, and then they will be free-swimming several days later. Remove the male and allow the young fry to develop.

Closing Thoughts

Koi betta fish are indeed visually stunning and can make a great addition to any aquarium. Their unique patterns and colors make them a popular choice among fish enthusiasts. Additionally, their low-maintenance care requirements make them an ideal choice for beginner aquarists.

It’s important to note that while these fish may not require a lot of maintenance, they still need to be properly cared for in order to thrive. This includes providing them with a suitable environment, feeding them a balanced diet, and monitoring their health regularly.

Overall, koi betta fish can be a rewarding and enjoyable addition to any aquarium, but it’s important to do your research and ensure that you can provide them with the care they need before bringing them home.

Also Read: Black Axolotl Care

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