I have a closed canopy over a covered 75g with two 400w halides, and two bulk 4" fans from Princess Auto.... One pushes air in, the other draws air out at the other end... I have NO heat issues, my tank has only ever peaked at 83 degrees, when our air conditioner was not on for a few hours... during the day the temp is about 79 on average through the year.
If you can keep the heat away from the water... you wont have to cool the water.
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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