The inverts I'm planning to get would be like a clean up crew, which, if they can be mixed, would include Cleaner Shrimp and/or tiny-to-small Hermit Crabs. The list on LiveAquaria has a nice list which includes shrimp, snails, crabs, sea slug, sea cucumber, urchins and starfish, that are pretty small. Also depending on if a reef would be included or not. The hard part is trying to figure out which ones are worth the risk or not.