I would keep him on his own if you want to put the other fish in the DT. After you're finished treating him with whatever meds (sorry read the thread really fast) do a couple water changes. Clean SW is one of the best things to help fish heal. If the swelling isn't subsiding or healing then think about antibiotics but back to back, this stuff is hard on them. What do you have in the tank that he could be abrading his mouth on, maybe the cut end of a piece of PVC or something??
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