Okay, I have this 6 inch Christmas island imperator that was eating everything I put in the tank for the first 2 days. On the third day in the tank, he is covered in what looks like Ich and doesn't want to eat. Only other fish in there is a Naso Tang that is doing fine. No signs of aggression between the two. Water params are all normal, temp is stable. What could it be? Could I have over fed? Is that even possible? I fed him frozen krill and Spectrum pellets, loads of it and he gobbled it all up.