I use white corrugated plastic between all of my enclosures (more than 30 of them!) It contains water, blocks my chameleons from seeing one another, is lightweight, brightens the enclosures because it is white, and is quite inexpensive and easy to cut to the desired size. It is just like cardboard but it is made out of plastic. You can find it at Lowes in the sign (For Sale, No Trespassing, etc) area because some people use it to make their own signs. It costs me $7.99 for a 3'x4' piece. If it is smooshed between two enclosures it needs nothing else to hold it in place. Otherwise, I use a pair of super strong coin-sized magnets (one inside the enclosure and one on the outside of the plastic board) to hold it onto the side of the screen or glass enclosure. You could even put a piece under the screen enclosure if you are still concerned about water on the table or you could cut it to fit along the screen INSIDE of your enclosure. I also use it to divide larger enclosures (glass and screen) into two compartments to house two of my babies in one enclosure. I call it a duplex!
I LOVE THE STUFF!!

