I have always wanted to mix a substrate for Mali`s to dig out of. Well I started off using just play sand, organic potting soil, and decomposed leaves. (I read these are the ingredients for what "Reptile" magazine calls a desert substrate mix. But lo and behold (is that actually the phrase?) they dug up a pipe outside my house and I had access to the clay/loam that I couldn't of dug up before. I added it to my previous mix, the question I have now is, should I be worry about what could be in the loam,clay, getting in my Mali`s cage? Aren't there bugs and bacteria? I want to use it but it scares me a little. I know in the wild it would be the same situation but I would feel horrible if something I put in there got them sick. So, how has it worked for everyone else?