I have this problem in my 1.5 meter tank now i would like to list the fish that are housed together i have four triggers the clown,niger,picasso and the brown/green one with yellow stripes there is also a large twin spot wrass large 20cm a juvenile emperator angle and a matted file fish now the problem is the tail fin on the emperator and the wrass and the file fish have all been bitten to such an extent there is not much of it left none of the triggers tails are affected now all the fish seem to get along nobody is being chased or bullied so what do you think is happening to the tails on all the none trigger fish? any ideas here guys also will their tail fins grow back ?