what you are describing is called Ick, tangs are very suseptable to getting this, it is little parasites, fish will get it when they are stressed (ie, new tank, new tankmates, fish picking on them etc) The things I would do would be to get some garlic extract or selcon and adding it to the feedings. Turn of the lights and let him get settled. There are treatments that you can get that are not very expensive that will treat ick, make sure they are coral safe if you have corals..
Best of luck
any other questions do not hesitate to ask,
Kris
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