Seriously.
What size tank is he running, how old is the tank (meaning how long has it been up and running), what are his parameters at, what size is the angel, what other fish are in the tank & how big are they, and what filtration has he got set up? How bad is the ich? I agree with Syn if his tank is lightly stocked and the angel isn't having to fight for its food. If it's not acclimated to the tank yet, and isn't feeding easily and often, then moving it to QT where it can live/eat without harassment might be better. Being the new fish in a tank almost certainly caused the stress that brought out the ich. It needs less stress right now, not more.