Will a betta fish eat itself?

Betta fish are not known for eating themselves, but they may occasionally take a bite out of their own fins. This is usually done out of boredom or stress, and is not typically a cause for concern. If you notice that your betta fish is biting its fins, you can try to provide it with more stimulation by adding plants, toys, or other objects to its tank. You can also try to reduce stress by keeping the tank in a quiet area, and by avoiding sudden changes in temperature or water conditions.