Update.
The tang did pick up a bacterial infection as stated earlier...i fed him three times a day with mostly garlic soaked seaweed and mysis and prime reef. After 4 days of noticing this infection i decided it would be best to dose the melafix. So i have been dosing that for about 3 days now and he seems to be losing it or atleast visually. His fin that was starting to rot has stopped and hes eating healthy. Tomorrow is the big 2 week mark, half way to the mark where if hes healthy he will be going into the main display. Hopefully my black friday doesnt turn too dark due to this fish, but i doubt it seems healthy.