Are scats community fish? If so, there's a lot you could do. Dwarf Angels, a smallish wrasse, butterflies, clowns, damsels, etc.. As for cleanup, keep it diversified. I personally would go with about 5 turbo snails, 5-10 scarlet reef hermits, an emerald crab, and the mix 'n match offer from IPSF.com. You can then loadup on cleaner critters, and their strombus grazers are terrific at keeping your glass sparkling. If you're not going to get into anythign aggressive, you could also add a pair of shrimp.