Zach Lunsford's photo of his 10g Reef Tank which holds "1 Percula Clown, 1 Four Stripe Damsel, 1 Serpent Star, 1 Coral Banded Shrimp, 1 Emerald Crab, 1 Curlycue Anemone, 2 Atlantic Condy Anemone's, 1 Red Tree Sponge and 15 pounds of Live Rock.
Smaller tanks make great Do It Yourself (DIY) Projects. They are fun, easy, inexpensive and go together quickly. Just modify the DIY 55g Glass Aquarium Plans to meet your needs. There are a number of Canister and Power Filters and Mini/Nano Reef Tank Lights which will allow you to keep corals in your new tank.