My Powder Blue Tang

[jpuch]

I have had this fish for a couple of months now, and all of a sudden he is deteriorating. When I first put him in he would devour any algae (usually the kent marine packaged stuff or other Nori that I picked up at the health food store) and frozen food I would put in the tank. Now he is losing a significant ammount of weight and does not seem as interested in any food. What can I do?????
Josh

 

[jake22]

What size tank is he in what other fish do you have with him?

 

[blutang]

Also, how often have you been varying the diet, and what are your water parameters? Have you introduced anything new into the tank lately?