Quote Originally Posted by rabernet View Post
People get plexi-glass custom cut to sit on top of a screen lid to aid in keeping humidity in the tank.
This is exactly right. I got some 1/2 inch plexiglas from Lowes here in town, cut it to fit my glass aquarium and drilled a dozen or so holes in the top. My tank is 55 gallons so I needed a good way to help keep humidity in. Now that I have it cut into halves the humidity is absolutely perfect with my waterfall in the half I have Nazgul in.