I agree with Kevin.
Also I might add that for a tang, these little buggers are very demanding as far as diet is considered... They require a constant food source, or they just quite simply aren't happy... Mine is still a baby, and can eat a sheet of NORI and come back for more... Also, they will eat Mysis shrimp like there is no tomorrow..
Mine breathes fast also, and I am starting to think it is normal for them... I think mine is out of breath because it won't stop swimming...
I hope the best for your fish and try to feed it often. good luck.