Heat is a serious issue with halides and frankly whether you go SE/mogul or DE is not going to solve any heat issues without some kind of thought towards that issue in the first place.
Evaporation is the key to economical heat control and is accomplished very simply with a fan or two. But evaporation means more topup, and more humidity in your house. Another minus is that if you cheap out of the fan, you will hear fan noise.
For heat control that doesn't involve increased evaporation you can always look at a chiller. Not terribly economical though.
I go with the fans myself. It is amazing what difference a small fan blowing onto your sump can make in terms of reducing your temp spikes.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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