I bought a butterfly fish last week, got him acclimatized and put him in my 150g tank with. I only have 2 tangs in the tank. yellow and powder brown. My powder seemed to bother him for a little bit then stopped but would start up a day or so later. Came home tonight and the butterfly was upside down in the rocks. I proceeded to get him out but he was still alive. He is basically hanging out in the rocks upside down. I can disturb and he will swim to the other side of the tank. Any suggestions on what to do besides getting him be himself? He was eating good until today.