I have a 20 long glass tank with a screen top. I went to lowes and had them cut a piece of plexiglass that covers about 90% of the top. I use forest floor bedding and when I put new bedding in it will spike to 80%, I just slide the plexi glass forward a few inches to allow more ventilation. When it gets where I want I just cover it back up. I also bought a $2.00 cabinet knob and pur it in the middle of the plexiglass so I can left it and move it easily. When I first set the tank up I only spot cleaned the first month and after four weeks the humidity was still staying over 50%, after four weeks I completely changed it out so right now it's sitting at about 70%.
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