We had similar problems. Adding a 6" fan to vent moist air helped a little but not nearly enough. Once we installed a glass top and enclosed the stand and sump area the problem disappeared. I ramped up the LEDs by 10% to compensate for light loss, routed a fresh air source to the skimmer and scheduled glass cleaning reminder into my to-do list on Aqua-Planner. Problem solved. As an added bonus, I only need one of my 200W heaters, the drone of the 6" fan is gone (plus the added electrical cost) and the furnace isn't on as much in cold weather.
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20 year old Hagen 100g 6' mixed reef. 36g sump with multiple broken Waveline products removed. Lights T5-LED combo.
1 Coral Beauty, 1 Flame, 1 Blue Tang, 5 Green Chromis, 2 Pajama Cardinals, Asst'd hermits & snails.
2 large boxes of broken expensive aquarium crap. 1 x VERY understanding wife.
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