I have a 24 gallon Lifegard AIO tank with a clownfish, royal gramma, and a neon blue goby. And 3 small, 1 large hermit, 2 Turbu, 3 nassarius, and 3 cerith snails. The tank has been running for about 7 months, 3 with fish in it. There also a scattering of corals: GSP, zoas, flavia, pocillopora...