I have had a lawnmower blenny for about 2 months now and I noticed that the tissue on the tail is gone. Then the next day the tail had completly gone away. It is trying to swim, but just hides most of the time. It will come out to eat occasionaly, but not like it used to. Could my Damsles have picked on him or could it be some fish disease? My local FS said that the Damsles were probably picking on him. They don't bother any of the other fish in there. Please help!!