I might be able to help you out. I have a fairly large yellow tang that unfortunately looks like he may be needing a new home.
I don't want to give him up because he's the first fish that I purchased and the only original in my tank but he's outgrown his home. His dorsal fin is in rough shape but I think it's because he's not getting the proper nutrition and the small confines. If your friend is still interested let me know.