I have a bioactive enclosure so I obviously use loose substrate, if you are worried about ingesting you can cover the top layer with large leaf litter and when feeding you can put them on top of a plastic lid in the enclosure or something that isn't the substrate but some snakes won't eat even after just being moved in the enclosure a little. The way I think about it is that they digest bones so a bit of soft substrate probably isn't gonna be detrimental.Originally Posted by Snagrio;2741754
Also remember that they need higher humidity when shedding so the substrate has to be able to handle this.
I'm sure you know but don't use pine or cedar or any wood that secretes oils, even kiln dried is risky!
One last thing (even though you haven't mentioned it) I wouldn't recommend aspen, even though they live in a pretty lowish humidity place they spend basically all their time in more humid places like rodent burrows and stuff - it also rots really easily!