Well the other day out of curiosity I set my accurite thermometer ontop of the substrate on the WARM side, and it read 80.. constantly.. Yet the probe is placed on the floor of the aquarium covered by some repti-bark that reads 91 degrees...

I thought it was correct to place the probe on the bottom to get a accurate reading of how hot the glass is etc..

There isn't much repti-bark covering the floor, just enough to cover the glass bottom. I'm wondering what the deal is, freaking out that my temperatures aren't right.

Anyone?