In one tank, I use a bioactive substrate, topped off with some sphagum peat moss. It's naturalistic, helps with humidity & keeps the mold down.
The other one has coco fiber... but there's more of a molding problem...
With juvies, I would highly recommend paper towel - no impaction problem. My naturalistic tanks are for full-grown adults only.
If you want to try a bio-active substrate, do a google search for "bio-active substrate" & you should get a few sites with descriptions of how to start them.
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1.1 Crested Gecko (Anton/Angelina & Harley)
1.1 Crazy dogs (Alex & Sadie)
0.2 Vacationing Kitties (Puddy, PeeWee)
0.1 Amazing Wife =o)
Charlie - RIP 9-8-05 (Veiled Cham)