Sick Tang (NOT EATING)

Okay this isn't a post from me I am posting ot help a freind that is not PC friendly...... He has a blue naso tang i believe and he has tried feeding it every thing he has had it for a month and just out of the blue it has stopped eating everything but flakes........ But it is barely eating that... He has tried everything from seaweed to roman lettuce. please help if you have an ideas so he doesnt loss this beutiful fish..... thanks Jon:( :(
 
it is a 120 gallon tank with more then enough room for this tang i have seen the same size tang in a 46 gallon that is better then this poor guy
 
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