I too have questions about leos on sand. I have an adult leopard gecko. Is it best not to put them on sand at all? I'm not sure I understand. Some say it's okay and some condone it. I thought it was a no-no for babies but okay for adults.
If sand is not recommend then what can be used besides paper towels? In my young uro enclosures I have artificial indoor/putdoor carpet, not the green stuff but the kind that's a little better. Should I use this instead of sand? Right now I have paper towels with a piece of terra cotta tile over where the heating pad is at. I didn't want my little girl to get burned
I've seen like those large river rocks for gardening in the garden section at stores. What is input on using those?

