Help! Sick kole tang!?

[celtic_drag0n]

I've had a kole tang for abou two months now. A couple of days ago I noticed some brown 'patches.' I don't really know how to describe it; it's brown and insmall patches around the fishes head, etc. The fish seems to have lost some of it's color, seems pale.

Please help!! I tried to take pictures, but they didn't show anything...

 

[bertoni]

Is the fish eating well and acting normally? What's it been fed?