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Is It Possible to Feed Betta Fish to Koi Fish?

Keeping fish as pets has become quite popular in the last few years. While betta fish are popular amongst aquarium enthusiasts, it is important to understand that they are not compatible with other fish species and need special care to thrive. There are certain types of fish that betta fish cannot be kept with for extended periods. However, if you already have koi betta fish in your aquarium and would like to know if it is possible to feed them with betta or vice versa, read on to find out more.

What is a Betta Fish?

Betta fish are also known as Siamese Fighting Fish or just Bettas. They are freshwater tropical fish native to Thailand and Cambodia and are one of the most popular aquarium fish. These colorful tropical fishes make great pets for both children and adults. They are also easy to maintain, which makes them a great choice for beginners in the aquarium hobby. Betta fish are also popular for being kept in small tanks or bowls.

They don’t necessarily need a big tank, but their environment needs to be clean and healthy. They are very active fish that need a lot of swimming space so they can be active and happy. Betta fish are also territorial and will fight to defend their home. When kept together, they will sometimes fight for the best spot in the tank, which can lead to injuries, such as fin damage.

Can you feed a betta fish to a koi?

Although these fish originate from the same region, they have different ecosystems and live in different conditions. Koi fish are freshwater fish, while bettas are also freshwater, but brackish. Brackish water is a mixture of freshwater and saltwater, with a specific salinity level. Bettas have gills, while koi have air bladders. Bettas are carnivorous fish that thrive on live foods, and some fishkeepers feed them bloodworms, brine shrimp, and crickets. Koi fish, on the other hand, are omnivores that consume both plant and animal foods. This means that you cannot feed your betta to your koi.

Koi and Betta Fish Together In One Tank – Are They Safe?

Betta fish should always be kept in brackish water, but koi fish thrive in freshwater. Keeping these two species together in one tank for a long period is not safe. Over time, koi will affect the salinity of the water, causing it to be more alkaline. In addition, these fish can spread parasites and diseases, which can be harmful to your bettas. Betta fish have very delicate fins and mouths, which are susceptible to abrasion as a result of fin-nipping.

Koi are large, active fish that like to swim around the tank, whereas betta fish prefer to stay close to the surface and can easily get sucked in by the current created by koi. Keeping betta fish with koi can lead to injuries or even death. Betta fish and koi fish should never be kept together in the same tank. Doing so will only cause harm to both species of fish.

Why You Should Not Keep A Betta and Koi Together in One Tank

Aside from the differences in their ecosystems and conditions, it is important to note that these two species also have different lifespans. Koi fish can live up to 20 years, while bettas are more likely to live for about 2 years. Keeping these two species together in one tank for long periods is not ideal.

Betta fish are very territorial, so keeping them with other fish can cause unnecessary stress. This can lead to poor health and even death. Keeping them with koi can affect the health of both species, especially koi, as they are much larger than betta fish. Betta fish are also more likely to be aggressive toward other fish, especially if the tank is too crowded.


Keeping a betta fish in a brackish water environment is not suitable for koi fish, so it is important to establish this difference when deciding which fish to keep in your aquarium. Keep in mind that these fish are very different, both in their ecosystems and characteristics, so it is important not to keep them together in the same tank. Doing so can cause harm to both species, which can lead to death. Keeping a betta fish in the same tank as a koi fish can also be harmful to your bettas, so it is best to keep them separated in aquariums that are large enough to accommodate their swimming requirements.



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