You are currently viewing What Are Koi Betta Fish | Everything you need to know about Koi Betta Fish

What Are Koi Betta Fish | Everything you need to know about Koi Betta Fish

The Koi betta fish is the name of a marble betta species selectively bred, to exhibit a similar color appearance as the Koi fish from which it derives its name. The Koi betta fish do not exist in the wild, but they can be created by hobbyists and on breeding farms by crossing marble bettas to other colors.

The Koi betta is a marble betta fish with more than two distinct colors and has more noticeable color lines than the marble betta fish hazy color lines.

Is the Koi betta fish popular?

What Are Koi Betta Fish

The Koi betta fish is always an extraordinary addition to any aquarium collection, and its spectacular colors make it incredibly popular among betta fish and aquarium hobbyists. The Koi betta fish is easy to care for and shares similar aquarium maintenance, and dietary demands with other betta species.

True Koi

True Koi’s are Koi betta fish that have mutated and are no longer marble bettas. Their ‘jumping genes’ which create pigmentation changeovers have somehow, become defective thus, these strains have quit changing their color patterns throughout their entire lives.

Adult size – 3 inches

Lifespan – 3 years

P.H level – 6.0 to 8.0

Water Temperature – 25 – 27 C

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Change Color – Yes

Family – Belontiidae

Diet – Carnivore

Aggressive – Yes

Origin – Tank-bred betta variety, but species native to Southeast Asia

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Do the Koi betta fish change color?

The Koi betta fish is a strain of the marble betta fish, and it posses the latter unique ‘jumping gene’ which allows it to change color.

However, color change in the Koi betta fish is gradual, and it does not occur as frequently as it does in other varieties of betta fish. A Koi betta fish can keep the same color pigmentation for up to 7 months.

Diet and nutrition

In the wild, Koi betta fish feeds on insects, insect nymphs, and larvae. The Koi betta fish has carnivore’s digestive systems suited for absorbing meaty diets, and they are fitted with upturned mouths for catching insects as they fall into the water.

What do Koi betta fish eat in captivity?

The Koi betta fish is easily looked after and can adapt to a diet of frozen, and fast-dried foods of brine shrimp, glass worms, and daphnia, all of which are great choices for feeding your Koi betta fish. Mature Koi betta fish should be fed twice a day.

What is the diet of a Koi betta fry?

Young Koi betta fries should be fed baby brine shrimp or fine baby food. Special care should be taken not to overfeed the fries because the leftover food still present in the tank can turn toxic with fatal consequences. Frys should be fed thrice daily.

Typical Koi betta fish behaviors

Anyone who had previously owned a betta fish would be quick to notice the similarities between the character of their koi Betta, and other betta fish varieties.

Like its other betta fish siblings, Koi Betta fish exhibits aggressive “fighting fish” behavior common to all the members of the Betta Splendens species complex.

It is common knowledge as any betta hobbyist knows that two adult male Koi betta fish should not be put in the same tank together.

The social behavior of Koi bettas can be interesting. Despite its aggressive nature, Koi bettas can live peacefully with other fishes as long as they inhabit separate locations within the tank and are not smaller.

Koi Betta fish usually avoid bigger fish that cannot be considered as prey.
Common behaviors associated with the Koi Betta fish include the following:

Bubble Netting

This activity indicates a healthy fish. This means that Koi Betta is ready to breed, both male and female Koi bettas can build bubble nests. This might indicate a hungry fish, or a fish unhappy with its current living

As an owner, noticing your Koi betta fish tank jumping is not a good sign and you must closely observe your fish. It is possible the Koi betta might be trying to escape from toxic water or water with irregular temperatures.

In the wild, Betta fish have been known to jump pool during the hot dry seasons in an attempt to find adequate bodies of water. - For all your creative needs!

Glass Surfing

A Koi Betta fish will often swim near the margins of his tank in an attempt to denote its terrain, and keep it safe from outsiders. Sometimes, when the fish is stressed, it swims extremely close to the side of the tank and may jump out.

The Koi betta fish may also be anticipating a snack if it observes his owner approaching the tank, and will swim close to the edge.

Distinguishing between male and female Koi betta fish

It can be difficult to determine the gender of a koi Betta fish before it reaches maturity, as sexual differences are not noticeable until the fishes reach maturity. However, differences between adult beta males and females are more noticeable.

Male Koi betta fish

What Are Koi Betta Fish

  • Ventral fins are wider and bulky.
  • Have a bulky body with a curved head.
  • More brightly colored.
  • Have more flowing fins than females.

Female Koi betta fish

What Are Koi Betta Fish

  • Have egg spots that look like a white lump between the head and ventral fins.
  • Ventral fins are thinner but of both the same length as males.
  • Have streamlined bodies.
  • Have rounder stomachs when spawning.

Suitable tankmates for Koi Betta fish

Koi Betta fish can be housed in a community tank with other fish although, care should be taken to select appropriate fish that can peacefully cohabit with the Koi betta.

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Female Koi betta fish can be temporarily placed with a male for breeding purposes, this procedure must be supervised and well-planned. Two adult Koi betta males must not be placed together in the same tank under any circumstances.

Female sorority tanks

Female Koi betta can be kept in the same tank with other female bettas. Aquariums, where multiple female betta fish are housed together, are referred to as ‘female betta sorority tanks.’

The betta sorority should be a minimum of 4-5 females, and the recommended tank size is a minimum of 20 gallons. It is not difficult to set up female sorority tanks, but certain guidelines must be followed to have success.

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If you are seriously thinking of adding a Koi betta fish to your existing aquarium collection, or if you want to upgrade from your solitary Koi betta tank with other exotic aquatic life, it is important to consider the following factors:

Tank size

Like most bettas, the Koi Betta fish is highly territorial and will need his space, and it is important to have this in mind when selecting a tank. It is advised to consider a tank with enough room to comfortably house both the Koi betta and other multiple fish.


Personality matters when selecting the type of fish, or aquatic life that would cohabit with your Koi betta fish. Every fish is different, and the Koi betta will thrive with peaceful bottom-dwelling aquatic variety. The Koi betta fish can be known to be hostile to some fish in the middle and top-water levels.

Tank hierarchy

When mixing the Koi betta with other fish, it is strongly advised to introduce the Koi betta into an established tank. The Koi betta should be inserted into the tank after all other fishes are present.

This action will reduce his aggressive behavior towards other fish, and the Koi betta will not feel that his territory is being invaded, and attack the other fishes right away.

It also helps the Koi betta fish to integrate better. Suitable tank mates for the Koi betta fish must possess the following traits;

Must be peaceful

The Koi betta fish neighbors must not be aggressive, and certainly should not be a predator. Special care should be taken to avoid fin nippers, as they cannot coexist with Koi betta fish without harming his delicate fins.

Must be dull-colored and short-finned

Koi betta fish male will mistake other brightly colored fish in the same tank as a betta fish rival and attack it. Similar looking fish species should not be housed together with the Koi betta fish.

It is advised to only select fish without colorful long flowing fins as Koi betta fish as it likes to be the only star of the aquarium.

Tropical fish

Only tropical fish should be selected as the Koi betta fish tank-mates. The Koi Betta fish is a tropical fish and shares similar water temperature and PH attributes with other tropical fishes. This decision helps prevent your Koi betta fish from unnecessary stress levels.

Examples of species that can cohabit with the Koi Betta fish are as follow:

Corydoras Catfish (Corydoras)

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Only tropical fish should be selected as the Koi betta fish tank-mates. The Koi Betta fish is a tropical fish and shares similar water temperature and PH attributes with other tropical fishes. This decision helps prevent your Koi betta fish from unnecessary stress levels.

Family – Callichthyidae

Origin – South America

Status – Bottom Dwellers

P.H – 5 to 10

Diet – Omnivorous

Lifespan – 5 to 20 years

Size – 0.75 – 4 Inches

Bristlenose Pleco (Catfish)

What are Some Aquarium Freshwater Fish that go well with Shrimp.

Bristlenose Pleco is a small size fish renowned for its abilities as an efficient tank cleaner. The fish can be seen displaying dull colors of grey, brown, black, olive with white or yellow spots.

Family – Loricariidae

Origin – South America

Status – Bottom Dwellers

P.H – 6.5 to 7.5

Diet – Herbivores

Lifespan – 5 + years

Size – 3 – 5 Inches

Kuhli Loach (Pangio Kuhlii)What are Some Aquarium Freshwater Fish that go well with Shrimp.


This fish is a nocturnal bottom-dwelling fish. The Kuhli Loach is a peaceful fish and spends all his time on the tank bed scavenging for food which sinks to the bottom of the tank. Kuhli Loach has a black or dark brown color, and it is not a threat to the Koi betta fish.

Family – Cobitidae

Origin – Southeast Asia

Status – Bottom Dwellers

P.H – 5.5 to 6.5

Diet – Omnivore

Lifespan – 5 + years

Size – 2.5 – 4 Inches

Types of Koi Betta fish

The Koi Betta fish exists in diverse colors and fin varieties, mostly new types of Koi betta are often an assortment of commercial descriptions and color combinations of existing marble betta.

Koi Nemo betta

What Are Koi Betta Fish

This is a unique high-end coloration fish with a wide display of colors. Individual specimens have been known to exhibit up to 5 colors.

Fancy Koi Galaxy

What Are Koi Betta Fish

This is a Koi betta combination with black iridescent and red marbling.

Other Koi betta fish types are:

  • Baby Koi betta
  • Yellow koi betta
  • Orange koi betta
  • Koi Halfmoon Betta

Aquarium Care of Koi betta fish

Care of Koi betta fish is no different from that of other bettas. Betta fish care is simple, and beginners can keep Koi betta fish as pets provided strict care guidelines are followed.

The Koi betta thrives in tanks with low water progression, mainly near the surface, and they must have calm spots within the tank. Tanks must be fitted with filtration and heating to maintain excellent water quality.

Tank water should be maintained accordingly; soft and warm regulated to imitate tropical conditions. Tank design should include a lot of plants to provide shade and hiding spots.

Like all bettas, Koi betta fish has a unique respiratory system known as the labyrinth organ. This special organ allows it to breathe directly from the water surface.

For this reason, Koi bettas must have access to the water surface in the tank. Long term keeping of Koi betta fish in small jars with inadequate space, filtration, or heating can result in the Koi betta being stressed resulting in the death of the Koi betta fish.


The Koi betta fish is a magnificent ornamental fish and a stunning variety of the Betta Splendens species complex. It is easy to care for and Koi betta fish’s vivid colors and magnificent fins make it a wonderful attraction in any aquarium setup.