What Substrate Should I be Using with a Ball Python?

[viper69]

You want a substrate that holds humidity. Aspen does NOT. Aspen will mildew and cause respiratory issues. Forest floor, cypress mulch, reptichip, coco block, paper, paper towels are all good choices.

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I've been using aspen for over 20 years. Never any mildew, and no respiratory issues with the snakes on them. The above statement is not true, ie it's not a guarantee. I've lived in the highest humidity areas and no issues with it.