Too much substrate

[Red357]

You already answered your own question..."too much substrate".

When substrate is deep, it is functioning as insulation, keeping the heat out. Substrates aren't all the same...those lighter w/ more air gaps allow more heat
to rise, while denser ones resist it. (for example, large nuggets of orchid bark has lots of spaces between, where heat can rise.)

🤔 so it is possible that I have too much substrate. What about the fact that the thermostat is cranked all the way up and the glass temp is only reaching at most 86? Can it be a faulty thermostat? It's a Zilla thermostat.

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