Substrate Question!

Hi everyone i am currently in the building process of making a rack system, but i just want to know the best substrate to use. I have one bp in a 20 gallon but im going to move him into a rack system because i am getting more snakes i use aspen bedding for his tank now but i want to know is that good or can i do better?

Thanks, Stealthclown :)

There is no "best substrate". There's the best for you, your needs, and what your snake likes. This can and does vary.

If aspen is working for you, and you're happy with it, keep using it.

Yep. Use what you like and works for you.
I use paper towels.