| I have an open back hood and a 12v PC box fan blowing into the hood over the bulb. My heater has to fight to keep the tank warm, and it drops about 1/2 degree when the light goes on. Also, having a sump (which I don't) goes a long way towards cooling things off, especially if you have a fan in the sump. I wouldn't recommend using a fan without an autotopoff though.
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Snail Whisperer
Member RSMC&RP
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