The diagram I saw in a cage-setup guide was to have the probes inside the tank, wired under repticarpet and poked out in the middle. Then they put a thin layer of aspen over that. I like the idea of having a layer between my snake and the glass/UTH but if it would be safe without it, then I'll just do the aspen. So you recommend putting the probe on the outside under the tank in between the glass and UTH?
The breeder I got him from said the eco earth would hold too much humidity and rot, but if it isn't a problem I would rather use that than wood shavings...