I hate to beat this dead horse but I just cannot see how that heat mat is staying 90f....measured on glass underneath substrate. That's impossible unless you aren't using the heat mat. I got out my small zoomed and put it unregulated under my spare 10 gallon tank we use for live feeders sometimes. Measured on the glass under the substrate (where you are supposed to measure it) it was 106 after 10 min and 109 after 20. It is a new mat that I just never used cuz I changed to Flexwatt. On top of 2" of substrate it was 98...after 10 minutes and 101 after 20 min. I guess if I piled 4 inches of substrate over it and prayed my baby never decided to burrow it would measure lower. SMH
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