I have one on a 30 gallon planted tank for my tokay gecko, and found out that the best way to keep the humidity from getting too high is to plug the air pump to the same timer as the lights. That way, the humidity cycles between a high and a low point during a 24 hr period, the plants thrive, and the glass does not remain fogged up for days after misting the tank so my gecko can drink.
I have also seen fan systems used to regulate humitity to good effect, by pumping in dry air and removing humid air out/
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