looks like maybe lymphocitis (spelling?)........ bumpy belly looks strange..... what are you feeding him?
I think at this stage all you can do is keep stressors to a minimum, make sure there is no fin nipping / bullying going on, keep water quality up and feed plenty of good quality foods, and generally just let them settle for a month or so.......
As far as the clown tang...... if he has a damaged mouth, I am sad to say it will probably be his demise.......
If you don't mind me saying, a some of your fish generally look a bit "rough around the edges" if you know what I mean....... they look a bit tired and battered from shipping / over crowding holding tanks etc. To reiterate, I think they all need to just "settle" with the minimum of intrusion and interference..... Just my thoughts though. As far as the clown tang - maybe someone else can offer some advice here, but to the best of my knowledge there is nothing you can really do, just hope for the best.
Best of Luck,
Matt