Hey all! I have a ten gallon tank (cycled, filtered, and heated) with a blue dwarf gourami and a golden mystery snail. We'd had a pest snail infestation that got out of control so I moved the fish and "friendly" snail and cleaned the whole tank out top to bottom (kept about 50% of the original water and replaced the other 50%) last Tuesday. On Thursday morning (7/16) I noticed that there was some darkening/damage on the gourami's top fin. I assumed that he had either hurt himself on some new decor or it could be fin rot due to the stress of the move, and began dosing the tank with melafix and monitoring the water quality (which has been fine--the nitrate was initially a bit high, but it's gone down). While the dark spots haven't really gone away, he's returned to a more active demeanor so I haven't been too worried and have continued giving the recommended 5ml dose of Melafix daily. This morning (7/20) when I took a look at him, he has developed a fuzzy white growth on that dark spot on his top fin! I thought that fungal issues were something that Melafix was supposed to treat and prevent, so I'm alarmed that it's happened while I've actively been dosing the tank. I just wanted to know if anyone has had any experiences with this or any suggestions with how to proceed--if I just keep giving it to him, should the growth go away? Is there anything else I should be doing to try and help him out?