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Do you have the fish in quarantine? Resistance to FW dips can vary, but I would try that first. Use the same temperature and pH. A couple of weeks in hyposalinity may work as well. If neither works then resort to a series of formalin dips. Tangs can be sensitive to formalin.
Terry B
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Knowledge first.
A large water change can cover a multitude of sins against your aquarium.
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