Oh no, Poor guy! Can he still manage to swim up to the top of his tank?

You can help him out with the healing by adding some Melafix to his water. It helps heal wounds, damaged fins, etc. One of my cichlids had something similar happen to him and the meds seemed to help quite a bit. I am not certain how long it takes for it to grow back, though...

Best of luck! Good vibes are being sent his way for a speedy recovery.



PS: I taked to a friend who owns bettas. Apparently there is a "BettaFix" that might work better.