One of my tanks is a 28 gallon bow. In there I have two false percs, a bicolor blenny, a bubble tip anemone, a brittle star, a couple of cleaner shrimp, a couple of emerald crabs, a few hermits and snails, a toadstool leather coral, and an assortment of zoanthids and mushrooms. All are healthy and well.
The key with any tank, but I think especially for a smaller tank like this, is to go slow! I started out with a small cleanup crew for a few months after my cycle, then added the perculas, and then slowly added various other critters. I've certainly lost some things along the way (when in doubt, leave it out), but all in all it has been a very stable healthy little setup.
Best of luck!