Here's a link for glass tank setup that should help.

http://www.ball-pythons.net/forums/s...ad.php?t=32800

You should at least cover most of the screen top of the tank to retain humidity. The method in the link will work, I just tape saran wrap over the top of mine, covering everything except where the light sits. I use clay pots as hides, and when I see the snake going blue, I thoroughly soak the clay pot in water, then place it back in the enclosure. This will raise the humidity in the tank, and create a "humid hide" at the same time.

Steve