Ok. So have this orchid dottyback. Has this large white bump on tail and a few dorsal fins worn. Been over a month. They are not spreading on the fish or to my other fish. STILL eating a lot. Eats everything I put in there. I selcon the food before I throw it in. No way can I get him out of the tank. Fin Rot? Bacterial? Fungal? Couldn't find a reef safe treatment.