Has anyone done this for easier clean-up? I'm switching my Pacman from a Kritter Keeper to a glass tank soon so cleaning her cage won't be as quick and easy. I'd love to be able to just pick all the substrate up at once with no mess left behind. My only concern would be any chemicals from the plastic going into the substrate, thus into my frog. Is this something that would be safe, or is there something else I could use for the same effect? Burlap maybe or reptile carpet?