Start w/3 blue/green chromis. Add a pistol shrimp and goby pair (5 or six shrimp gobies to choose from at Liveaquaria.com). Situate your rocks firmly on the bottom for gobies and shrimp that may tunnel. Add a pair of neon blue cleaner gobies. Bring in some cleaners (hermits, snails), and cleaner shrimp. Include 5 or six peppermint shrimp to keep any aptasia at bay.
Get a blenny. Fun fish. Of course a mated pair of clowns. and a tang suited for your tank size. Then maybe consider a deresa clam in the sand.
Other choices may include royal gramma, orchid dottyback, reef-friendly wrasse (something that stays less than 3"), and firefish.
Aw man, I think I accidently described my 75g tank!
Hey, it works very well for me. Got the high rock dweller and roamer @ the top (midas blenny), low rock dweller (neon goby), sand dweller (watchman goby), swimmers (clowns and chromis), and a firefish (sits out front & low, posing for the cameras), and the big centerpiece tang (not yet, but coming).