Both my bettas kind of got into tail casualties... one got stuck in SOMETHING, trying to figure it out, but a huge chunk (not tailbiting) got torn. He's fine though, it's definitely healing. The other also kind of got ripped from something on his upper-fin(??). It looks like a bite, but it's weird...why go for that, instead of the tail? But it's also healing fine. Lol, I quit going to the pet store with my parents. Only friends now!! Haha