I just moved my powder brown tang from my QT tank after 30 days into my DT. He has been in my DT for 7 days, eating great, swimming around and not shy at all.it was swimming this morning when I left for work and when I came home he was dead? I only have a small rabbit fish, a Timor wrasse and a small flasher wrasse in my 120 gallon DT. When I got the tang out I noticed his belly was white? It might be normal when they die but I am not sure.really just looking for any ideas of what might have happened?