What do tails and fins have to do with the tempermant/tank mates of the fish? The reason the beTTa ate the fry is because thats their diet. They WILL eat live foods, given the opportunity. I have 2 corydoras in my betta community tank. As far as I can tell, ones a male and ones a female. The bettas are a great benefit in the chance that the cories will produc fry. I can't support cory fry right now.