I got my boy Rocky from Petco awhile back, because he had horrible fin rot and a swim bladder problem. His fins were growing back great, but now, a few months later, I just realized his tail looks horrible! I feel guilty for not noticing earlier. It's a terrible picture, but I think it gets the point across. Is this fin rot, or something else? Maybe fin nipping? He's a rosetail, if the weight of his fins may have something to do with it. I think I'm going to gradually add aquarium salt to the tank regardless of the cause (1tsp per gallon?), and if it is fin rot I'll treat with Jungle Fungus Clear. I'd just like some help diagnosing. Thanks!