I am unsure if he has a skimmer on his current tank. I know that he had 2-3 fish in there last time we were over; one looked like a butterfly fish but was black/purplish.
I really like those scooter blennies, and the smaller, brightly-colored clownfish. Either clowns, or butterflies.. thanks for the tinfo guys, and I plan on reading, reading, reading!