You really want coconut fiber, cypress bark, or orchid bark for a glass tank to help retain humidity. Temperature control should not even matter really with substrate and ball pythons as they will push and dig to get down to warmth. CHEs do tend to dry out much faster than RHPs due to the higher heat generated but as far as one cusbtrate retaining heat more than another, I don't have any hard and fast numbers. More substrate acts as insulation against an UTH so that would be why most people recommend 1 to 1 1/2 inch of substrate in a tank.









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