Sick tail on a Shoal Tang

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Hi I bought a shoal tang there in dallas. He looked great & is still eating good. I saw where his tail has what looks to be a thick white stuff on the top half of its tail. I bought the fish 2 weeks ago & he had a hard time getting it out of the rocks so I am thinking it hurt its tail then & is now showing up. What can I add to my tank to help the fish get better.He has made friends with all the other fish with no fights. I cant get him out without removing all the rock. I have way to much in there because allot of it goes into my new tank that is not up & running yet. I dont want to wait to treat it as it looks bad to me. I cant get a good picture of him as he is sick so he is now starting to move to the back when we go by the tank. I will feed when the lights come on & see if I can get a shot of his tail again today. I tryed yesterday but it would leave when I got close to the tank.

The tank has corals & a few snails & crabs in it along with other fish.
 
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