Could that be because generally Sw don't have glass tops? The water temp is within a few degs of each other. SW does have more surface aggitation to increase the evaporation. Hmmm..... Maybe I'm worrying about nothing. On the other hand if it does get moist, maybe the wife won't want to be there. Another plus for no ventalation 
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Marty
50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor
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