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Zoo-Med Eco Earth. If possible get the non compressed bags of it instead of the compressed bricks.
http://www.petsmart.com/product/inde...AvailInUS%2FNo
http://www.petsmart.com/product/inde...AvailInUS%2FNo
Try switching out your damp towel for some aluminum foil.
Here is how I setup glass tanks: http://ball-pythons.net/forums/showt...With-Pictures!