where to place thermometer probe at inside tank

[Eric Alan]

Having one of the probes at the hottest point is what's important. For you, that means the temp of the ground immediately above the heater.

Your BP can/will push the substrate around and your job is to ensure that it's safe for it to do so once it reaches the bottom.

[Lacey]

so the glass reads 90 which is the what i want i believe. but the bedding reads like 86 i should be ok then correct? doesnt seem the heat thats on the glass tranfers threw the aspen that well but shes moving it around and is probley close tot he glass then what i can measure

[Eric Alan]

Perfect. You're right - aspen doesn't transfer heat well. It also doesn't need to. Your BP will do what it needs to do as long as you've set it up properly to do so (which you have done). Great questions - and great job!