Michael McClintock's photo of his incredible 1g Micro Reef Tank which includes a Percula Clown, Peppermint Shrimp, 2 Blue Hermit Crabs, a Colt Coral, Green Star Polyp frag and a Button Polyp. Michael uses a 10 watt 50/50 light, a 5 watt heater and the original undergravel filter that came with the tank.
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.

