What Substrate Should I be Using with a Ball Python?

[Stewart_Reptiles]

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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Funny I have used aspen for 14 years without a single RI. Again depends on the conditions not everyone needs a substrate that holds humidity, as for mildew the key is regular maintenance.