Thanks guys, I do have an aquarium heater in there now, obviously not big enough. I was just looking to see if anyone had a particular model that they preferred. Also I am actually a dirt warrior (I bow to your greatness, oh powerful hydro masters) so I have no idea what DO means, tho I have seen it a few times looking around in the aero/hydro section to find answers to my cloning issue. If you could elaborate that would be great. Thanks again guys.