Try to get some more pics. There is a parasitic disease called black ich. not related to regular ich. It is caused by flat worms. Tangs are particularly prone to this relative to other fish.
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I have a tomini doing this right now. My rock work was glued together with tons of caves so I can get her out and have no clue what to do. I have done 3 rounds of prazi and 15 days of feeding food bound with kana/metro (killed $300 of corals in the process unfortunately so can't do it again).Just a little update. I moved her back to the DT over the weekend. She is still a little skittish, but she comes out and swims and eats. Thanks for all of the help.