I have a Naso Tang that is losing wieght. I have him in my 225 gal. reef tank he is about 12 inches. I try to feed him every day with spirulina wafers, brine with spirulina, and caulerpa or red gracillaria. He is a very picky eater but he does eat. The other fish eat most of his food. What can I do without over feeding the other fish? Please Help