I know a guy who works in a pet shop, we were in there getting some feeder rats tonight, and I showed him a video on my phone of our newest snake, a six month old northern pine. I thought he would like it . He immediately pointed at the screen and said "you can't keep him on that. That's aspen. I've lost so many snakes because of aspen" I assumed he meant from impaction so I assured him that I take measures to prevent that. I use a food bowl for the ones that eat in one spot, a paper plate for the ones that move around a little and a plastic tub for those that like to roll around while they are eating. But he said "no, its not that, its not good for them, look, see the way he's acting, you can tell he's unhappy, he's trying to get away from the aspen, you need to get him off the aspen right away" Is there something I don't know about? I use aspen for everything except hatchlings (paper towels for them). If I really need to stop using it, I need to know.