I did it and it was great. Had to give it up though as I couldn't keep it cold enough as I didn't have a chiller. Do not attempt it if you do not have a way of cooling the tank sufficiently.
I had a 3ft tank with an Aquaclear filter on it. Nothing else. Had brittlestars, anemones, sea cucumbers, chitons, hermit crab, shrimp, rockfish etc. Even had a little octopus for a while until it escaped and got fluffed to death on the carpet