I would do:
Yellow Watchman w/ pistol shrimp
Six Line Wrasse
Pair of skunk clowns
That's already probably the maximum bioload IMO.
When I owned that tank, I had 2 Perc clowns, a BiColor Blenny, and a Blue/Green Chromis in it. It seemed to work well. Man, I miss my Bi-Color Blenny
