A fish that isn't eating is usually a fish that is under stress. The stress can be anything including but not limited to: The environment, tank mates, water chemistry, poor acclimation or just the inability to acclimate.
Hopefully the tang is in a quarantine tank where you can focus on getting it to start eating. If it isn't, then it is harder.
You have to offer foods and remove as many stressors as you can find and think of or, at least reduce them. Since I don't know anything about where the fish is being kept or the marine system you have it in, I can't help you there. It is up to you to find and manage those stressors.
As far as what foods to offer, you need to constantly offer (during the day) macro sea algae. In addition, if it is a small fish, also offer pods. Offering the food in different places is important, too (see link below).
These posts should help you, if you have the time and can read them closely: Food Presentation
There are many posts and articles that will help you, even though you've been here before. This post has the links to other posts and articles: Table/Contents - Link List
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LEE
Post your fish care and health questions on the Reefland MARINE FISH: CARE, HEALTH AND DISEASE TREATMENT Forum.
Post your fish care and health questions on the Reefland MARINE FISH: CARE, HEALTH AND DISEASE TREATMENT Forum.
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