Well these are ok:
News paper
"CareFresh"
Pine
Aspen
***on wood/loose substrates just be sure your snake doesn't ingest the substrate.***
what i DON'T recommend is CEDAR or WOOD CHIPS,
*Cedar is poisonous to snakes
*Wood chips hold more bacteria than you can imagine (after they have be soiled a few times)

hope that helps
~ZF
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Bklyn's Finest Brooksi & Goini Fanatic

