I like the brick idea, and also thanks to Cable Hogue for his excellent suggestions and tips. I have some heat tape and may lay a strip of it under the cage, under the end where I can put some bricks with a nice duffy ultrafine alluvial soil I got from the banks of the Salt River in Arizona to use for desert lizards to lay in. The soil makes great burrows without cave-ins, holds and wicks moisture beautifully and is fine enough for the smallest desert lizards to easily dig in.

I forgot to mention the rest of the substrate is wild sand from the shores of the Great Lakes. I like wild sand because its grains are worn smooth and less likely to interlock if swallowed--easier to pass, is my thinking there. Play sand is obtained by harvesting sand from quarries or by breaking up Quartz deposits. Without spending time being churned by waves or blown by the wind, I worry that sand retains its sharp interlocking surface contours and is not only more likely to cause intestinal impactions and abrasions, it's more abrasive to live on.

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