Sounds like your Tang is uncomfortable/unhappy in the tank, any other fish or creatures in there harassing it or spooked it? Anenome maybe? either that or it may have been caught using Cyanide poisoning so its internal organs are stressed out / possibly deterorating if its cyanide caught, you will know in about 3 months or less if its cyanide caught usually when its body starts to turn blackish or dies.
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