I found my Dorrie (regal tang) lying on the bottom of the tank this morning. It lost most of it's blue color and was breathing heavily. It kind of attacked me when I picked it up and then died. No very nice. I have added 2 common clowns and an anemone with it to the tank on Friday and everyone was still very happy last night. It's stomache was a little bit swolen, but that is all. I also have a yellow tang and cleaner wrasse, leather coral and brown star pollyps. Last time I measured the ammonium and nitirites were zero, pH 8, KH 9, nitrades 25 ppm, calcium 350 ppm (trying to raise it), magnesium 1250 ppm, phosphates 0.25. Could the anemone have stung it? I want to try and find out what could be the cause before I buy another one.