I've kept a 100g with 30g sump in a finished basement for over 20 years.
Usually I keep the top covered but recently (2 months ago-ish) I installed a screen top. Our house is a modest 1100 sq ft bungalow built in the 50s with no modern air exchange system. We did however, totally clad/seal the house in rigid foam insulation under new siding about 5yrs ago so it has little "involuntary air exchange" lol. Still no difference in moisture levels.
My top off water consumption did increase by 30% when I switched to a screen but we haven't noticed any extra condensation with associated mould or mildew. Interestingly, we notice FAR more condensation/moisture etc from cooking than we do from the aquarium.
You're welcome to drop by to check it out. PM me to set up a 'tour' if interested.
Cheers
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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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