If any one has any info that would help please reply. I've had the tang in the tank for almost two weeks now and all the sudden this smornin' he didn't wake up like his yellow colors didn't come back and he was floating around the tank upside down, i have 2 damsels and a clown and a puffer fish in with the tank which the internet and the pet store is fine because the tang is a hardy fish. The pet store told me to put him in another tank by himself and he is still dying. The salt water is perfect and so is the pH. I"ve noticed that the clown and the puffer picking on the tang the store said that they could of stressed it out but i thought it was a hardy fish and it would stick up for its self. But they also had it in the store by its self for 6 months...if any one has any info please reply i just don't want my other fish dying too!
Thanks bunches
Corinna

Yellow tang can be a hardy fish but they also can have a problem eating in a fish tank over a reef tank. Did the Tang ever eat since you bought him?