Hi. I'm currently caring for ball pythons and breeding mice and rats. As of now I am using aspen shavings for my balls and compressed newspaper pellets for my feeders. I'm wondering if anyone could tell me the substrate they recommend that can be used for both, I know either one "may" be used for both, but I would love to here your opinions on the "best" substrate. Also I have just built my first rack. It's an 11 shelf 28 quart melamine rack and I'm very proud of it and I would like to send a huge thank you to Pwilliams58 for the directions. My question for the rack is I see a lot of people using a white newspaper in the rack systems, could anyone inform me on where I may find this?