I use the core mats but have layered it. Hydroton, core mat, sphagnum moss, core mat. The moss holds moisture for the spring tail to live in & helps with humidity in the tank. Now if a feeder bugs gets out of the bowl I don't worry about impaction because of substrate & Meshack LOVES to stalk the occasional free runner. They really don't spend much time on the floor, but then they are tree frogs and seem to love all the other optional hang out places provided for them. Also the tank has a nice clean smell to it now.
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