depends...will it have a fan sysyem? will it be suspended or resting on the tank?
either way you choose, i would suggest one fan pulling in air, one pushing out air on the opposit end of the hood to help keep the water temp lower.
suggested hight would be 7"-8" from the water surface.
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GIVE A MAN A FISH, YOU FEED HIM FOR A DAY.
TEACH A MAN TO FISH, HE FEEDS HIMSELF FOR LIFE.
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