Can I move my baby onto a soil substrate?

She's on some now, but that's because I didn't plan on feeding crickets - can't find them small enough. But should I find some I'll switch her to paper towels. But just wondering when I can permanently move her onto the soil substrate
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1.0 Ball Python "Aragorn"
1.0 Kenyan Sand Boa "Gimli"
1.0 Saharan Sand Boa "Frodo"
0.1 Rough-Scale Sand Boa "Arwen"
0.1 California Kingsnake "Gentoo"
1.0 Mexican Black Kingsnake "Indigo"
1.0 Snow Corn snake "Chile"

0.0.1 Crested Gecko

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"Kira"