There are several shell-dwelling Tanganyikan cichlids of the genera Lamprologus and Neolamprologus that would work in a 10 gallon. See the following article (note species link) for information regarding care of these species:green_fox;593986; said:or other lake cichlids
what about golden juliesmike dunagan;594194; said:shell dwellers are great. The color may not be as bright as the others, but you should still enjoy. I would be sure in that small tank to check the sex of the fish to prevent overcrowding of males... or to keep a female from getting them all worked up. Remember to add tons of shells. They are fun to watch when you do this