I unfortunately picked up ich in my mixed reef 210 gal. tank and have just completed my second dosing of Kick Ich. I also have a Kole Tang that at first was starting to lose pigment around its head and just above the left eye so I called my lfs and asked for an opinion of what might be the cause. Their recommendation was to soak the nori in VitaChem due to the Tang's lack of vitamins causing the loss of pigment. After 2 weeks of this treatment the color has come back, but the overall color of the Tang has gone from a dark gray to a light pink. The fish is still eating quite well, it is just bleaching its color. Can someone give me an idea of what is going on and how to treat it? 
