Copperband Butterfly

[1bigstud]

Just under two week ago I bought a copper band butterfly.
I have a 75 gallon reef with about 120lbs of live rock, a 30 gallon sump.
My water quality is good.
In the tank are 2 clown fish, a flame hawk, a golden head goby, a melanarus wrasse and two clown fish.
The first week he was very skittish. I havent seen him eat yet during the first week he always seemed to be chasig food when I fed my fish. I feed frozen mysis.
Lately he looks very beat up and seems lethargic. hes got a few white spots on his fins and looks very beat up in general.
Any ideas what could be wrong and how to cure him?