No tangs, but you could do a number of different things.
What kind of tank are you envisioning? And what corals do you intend to keep? If you don't have a "fish wish list," you can start with that and figure out what's compatible.
The footprint of this tank will restrict your options a little. Smaller fish will make your tank look bigger. Unfortunately, many open-water swimmers will be cramped in there.
Clowns would be good, along with gobies, cardinals, a midas or tailspot blenny, smaller wrasses (like possum or pink-streaked), assessors, a leopard or blue-spotted toby (if you're not planning to keep shrimp or crabs), scarlet hawkfish (same), a pair of filefish (harlequins if you can find a pair on Divers Den). You could do a small colony of barnacle blennies - they're a hoot as long as there's nothing in the tank that will eat or scare them into jumping.
You could do a smaller dwarf angel if you're not planning to keep LPS.