With a wide variety of soft corals keeping them company, Brian Blackthorne's two Percula Clownfish look right at home in this picture of his 12 gallon nano-cube reef aquarium.
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.