Young Nasos are supposed to have white spots on their sides.
I can't really add much to what's already said. Drop the temp a few degrees, do a water change, inspect the filters for any trapped goo, watch the other fish very closely to see how they are and how they interact with the Naso. A rabbitfish and a tang being buddies strikes me as very odd. Are you sure it's not a case of bullying instead of just hanging out together? What are the other fish?
Your fish may have intestinal parasites which are costing it it's appetite. You might try some pepso food if you canget it to eat anything. Some prazi-pro should work if it won't eat, but you'll need a separate hospital tank.
A freshwater dip is a good appetite stimulant as well. Come to think of it, there are some productsyou can buy & use for appetite stimulation. I've never tried them, but maybe they work.
Finally, of course, try some different foods, like spinach or something.
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