Taridan
Fishaholic
I had a 30 gallon community tank with three female betta in it and they were all getting along fine. I come home from work today and the the one has almost a dime sized chunk of scales and flesh missing from right near her spine, just between her head and the back fin. I've moved her to a hospital tank and added aquarium salt and some Melafix which is all I have at the moment.
I don't -think- her spine got damaged, because she can still swim, but very painfully looking and with fins clamped tight. All tank stats are normal, All I can think of is she either got backed into a corner and had to scrape against a decoration to get away, then the fish kept picking at that wound, or my Pleco did it... Any help on other things I can do? I've never had to euthanize a fish before... 

