Ok.... I just completed a 20g refugium that i custom built to fit my stand. I have 2 tanks set up (75g Hexagon tank with 10g refugium....55gal with the custom 20g refugium). The 75 is down right now because I'm in the process of moving. I'm using my 55 to store all my live rock (appx 200lbs), corals, leathers, and fish. Right now its sorta crowded but in a week i should have the 75 up and running. Assuming that I don't have to wait for my tank to cycle again when I buy a few bags of live sand. I love this hobby more than I love my own wife.... Lol.
By the way, a 10g refugium doesnt leave alot of room for a protein skimmer. Thats the main reason that i built my own. By all means... Avoid Coral Life skimmers... They are over rated!