Not sure what is wrong with it. It isn't ich. There aren't any spots I also treated it for ich cause I thought it might be it anyway but it didn't help. It's tail wore away to pretty much nothing now. It has a pretty good size spot on its side that is almost like dead skin looking, its just rough looking and kind of pale, the spot that is. I thought maybe one of my other fish had went after it or something at first but I haven't seen anyone even around it. It eats normal and everything. Not sure what to do. Any help would be great.