ok so i was talking to my LFS guy about a good reliable mini heater to use on my edge... he actually recommended an under the tank riparium heater.?.?. Ive never thought of using an under the tank heater until he mentioned it, cant believe ive never seen it done before. Makes perfect sense though, its about 2/3 the size of the base of the stand and maybe 1 credit card thick, plus nothing in your tank and nothing clogging up your filter!!! Anyone out there ever try this on a nano tank? any input/opinions?