As stated in the title my newly imported marble is litterally rotting alive. Ive never seen this happen. He is in the same tank as 6 other rays, all of them in very good shape, 4 of the others were imorted at the same time. This guy was put into isolation in a floating basket since day 1 as he looked rough. My water perams are impeccable. ph neutral, 0 ammonia, 0 nitrite, 5 or so nitrate on api test kit. Temp is 78-79. Ive been treating with melafix daily. Ive literally watched day by day the flesh just rot away. Ive been using a small baster to flow water current on the sores to remove all rotten flesh. Any help or suggestions would be much appreciated.