I have a 55g reef with a pair of maroon clowns, a lawnmower blenny and a watchman goby/pistol shrimp combo. Some would think that lightly stocked but my fish are happy and with the large clowns, there is plenty of activity in the tank.
You have a good many options with that tank. You could do a pair of smaller clowns with maybe a dwarf angel. And then maybe a school of chromis. And then maybe a smaller fish like the gobies and blennies. There are lots of them to choose from. If you keep it a community tank, you have alot of options on ornamental inverts as well. Pistol shrimp, cleaner shrimp, crabs, etc. Look around your lfs
, see what's available and research things that catch your eye. Plan out what you want before buying and be sure to add the fish slowly. Oh, and QT.