best thing i have found for torn / dammaged fins in mellafix its a tea tree oil that speeds the healing process
I'm pretty sure it is a goldfish, but for a second, I'm thinking it might just be an orfe (pic below), which are common as pets in Europe, and are sometimes pets in the US. I'd say his fish is a goldfish as a final call, though.I am not positive the fish in the picture is a goldfish. Something just doesn't seem right for a goldfish but I can't quite put my finger on it.
A clearer pic would help but I know how hard it can be to get a clear pic lol.
You might want to put out a craigslist ad, but make sure you're clear that it's nasty. If it gets nasty enough and you can't find a new home, you may want to look into it becoming food or even euthanizing it. I don't support euthanasia of fish when it's not completely necessary, but it is an option.As far as i can see here, you have 2 options, either get rid of this fish, or just keep him and nothing else. There is a 3rd option but it doesnt always work. Get a breeder net and keep him in there for a week, then let him out. Everytime he shows signs of agression, back in the net for a few days.