Hi Laura, what kind of fish do you have in the tank at the mo? You could get some Dwarf Loaches, they're pretty cute and don't grow that big like Clowns?
Well, I'm a khuulie fan myself. Though you do need to get them in small schools if you want to see them. But they are lovely little creatures. Another one I like the look of, though I've never kept them is the Sidthimunki.