Adult naso tangs, like adult angels, go on a hunger strike and often refuse to eat. They eventually just starve to death in the reefers tank.
I don't know why LFS continue to import them.
Follow the advice re: variety of foods and garlic extract.
Avoid to much contact with the tank as you will just further stress the fish.
Check your water parameters to make sure it is not a water quality problem and ensure you have lots of oxygen in the tank by placing a powerhead 8 inches below the water line.
Good Luck
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