i think the best way is to put it under the substrate ( as long as its statted) because corns absorb heat through there bellies
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Mats should be on the base of the Viv and statted, that will heat the substrate to the correct temps required rof your corn snake. about 27 - 29 in the hot end.
Also curious to know what VET gave you that information so that i dont ever go there, your VET is not giving you very good advice.
one vet said that another had never heard of wall mounting heat mats. Do u put substrate over the probes?
Wall mounting mats is pointless as matty said, they generally heat on contact so if on the wall they wont really heat anything.
Probes best on the mat. with only about a cm of substrate over the mat.
With the aspen over the probes or the probes over the aspen? I currently have a space on the mat for the probes with the aspen around the rest of the mat. I just sprinkled it on.