I pretty much only like aspen. The problem with a substrate that retains moisture is it is then prone to mold. Aspen will only mold if you have a big water bowl spill. It's fairly easy to just get in the routine of putting plastic wrap on- I get the holiday colored wrap and lay a sheet of it on top of the viv, and then just crumple it up and srote it right there until the next shed- and misting lightly.
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