I recently had one of my snakes sneeze and expectorate mucous. He was "blue" and getting ready to shed. Vet reports indicated no respiratory infection. Snake now has shed and appears OK. I keep all my snakes on Sani-Chip Shredded Aspen? My thought is that the shredded material would not be as dusty and contain little "fines" that could be breathed in. Pros and Cons of both? Thanks very much. Don