Naso tang, rabbitfish or sea hare?

[karazy]

I'd do what Myka said, take out the algae manually, and maybe take out one of your larger fish.
you could also try a blackout for a day or two.

I think that the naso tang wouldn't be a very good choice at all considering that it might not even eat the algae (every fish is different)
and also because if you cant get rid of it you've got a pretty big fish on your hands (ive seen some 16 inchers while snorkeling)