Well I broke down and got a salt water tank. Its not much right now. Actually its not even filled with water. I just moved the 20L where I want it to be and I'm about to start setting it up. I have a Millennium 3000 filter, live sand, 4lbs of live rock and thats it. The guy at the LFS said I wouldn't need a light till I start putting corals and inverts into the tank. I'll have pictures to come tomorrow once I can find my camera.