Koi Betta Fish: Discover Our Complete Care Guide

Observing the colours of your betta fish dance across your aquarium is one of the pleasures of owning one. The show will be even better if you choose a koi betta fish. Aquarists appreciate the vivid marbled colouring of these fish.

Learn how to maintain the happiness and health of your koi betta fish by reading this care guide.

Overview of Koi Betta Fish

Koi betta fish are just standard betta fish without any koi genetics, despite their dual moniker. They are unique due to their exquisite marbling, which is evocative of the hues of a koi carp.

For an even more unique appearance, marble betta fish were crossed to create koi betta fish. A transposon gene, which can alter over time and destabilise pigmentation, is the source of the marbling.

Koi betta fish are selectively bred in order to preserve their genetic makeup. Though practically any colour pattern is conceivable, the most common ones are in tones of rich red, orange, black, and yellow. These vibrant patches have iridescent, shimmering scales. More costly koi betta fish may feature purple, pink, green, or blue streaks.

The Behaviour and Temperament of Koi Betta Fish

Particularly the males, koi betta fish have a tendency to be hostile and violent. Generally speaking, males and females coexist only when they are reproducing. If not, your female betta fish will be persistently harassed by the males, who will then follow them around to reproduce and attack.

To reduce stress, many owners keep their male betta fish in solo tanks. Potential tank mates should be peaceful fish that don’t resemble male bettas. Frogs and snails are acceptable animals as well.

Koi betta females are softer-natured fish. If you prioritise having a bustling, vibrant tank, these are a better option. It might even be feasible to maintain several betta fish in “sorority.”

Koi Betta Fish Care

Koi bettas typically have a lifespan of two to three years. However, your betta might live to be five years old or even longer with luck, decent genetics, and the correct tank. Ensuring optimal care for them is crucial.

This is important for you to know.


Koi bettas require large spaces. Their tank needs to be at least five gallons in order for them to flourish. Since they thrive in water that is between 75 and 82 degrees Fahrenheit, you might also need a water heater.

You may maintain clean water by using a filter, but be careful not to use one that is too strong. In tanks with a strong current, koi bettas could have trouble swimming. This is due to the fact that bettas inhabit shallow, still ponds in the nature.

You are welcome to add plants and toys to the aquarium. In the warm tank of the betta fish, live tropical plants such as Java ferns thrive. Be careful not to add anything with sharp edges that could rip their fins.


To take care of your koi betta, you need to provide it food that is high in protein and quality. They are hunters, and their mouths will swallow everything they can manage to catch.

Thankfully, their small size curbs their appetite, making feeding them reasonably priced. Betta flakes or pellets are available at any pet store. Treating these carnivores should involve feeding them brine prawns and bloodworms instead of fruits and vegetables that a goldfish might like.

Betta should eat for no more than two minutes twice a day.


Bettas, like many aquarium fish, are susceptible to Ich. When the fish are agitated and the water conditions in the tank are not exactly right, this sickness occurs. The appearance of white spots on the scales is the primary symptom.

Fin rot is another prevalent issue. It may occur when bacteria eat away at and damages the beautiful fins on your betta. The best defence against fin rot is to maintain the tank at a suitable temperature.


Many koi betta fish owners choose to breed their fish because they are so enamoured with the process. It’s a rewarding technique that keeps the renowned marbling intact for upcoming aquarists.

It can be difficult and time-consuming, though. It will also cost you money to buy multiple tanks because your male and female koi betta fish cannot coexist. One tank for breeding and one for each sex are required.

The bettas will probably take a few weeks to spawn after being transferred to the breeding tank. The male will construct a bubble nest where the female will lay her eggs. For the sake of your female koi betta’s safety, you should now remove her. Eggs will be looked after by the male.

But as soon as the baby bettas hatch, he stops being loving, and if he isn’t taken out soon after, he might eat them.

Where Can I Get a Betta Fish Koi?

It could be harder to locate koi bettas than a typical goldfish. They can be purchased online and at sizable or upscale fish stores. You should budget between $20 and $50.