I have read the care sheets, and they seem to mostly talk about air temp. I also understand that for UTH you focus on surface temp r/t air temp. In my 20gal setup (see pic), I have a 8 watt zilla on the left side of the tank, centered under the paper bowl. I put 3 liners between the glass and the newspaper to reduce the surface temp measured by a probe under the bowl taped to the newspaper, of 93F currently (thermostat in the mail). The bowl does quite a bit to trap heat and raise that temp.
My question is, because I'm using a UTH, how much need I be concerned with the ambient air temp in the rest of the tank? Directly over the heated area it appears to be 80 degrees. The other side is more like room temp, around 76 (But I could see this dropping when my house is more like 65-70 degrees). (With non-UTH I understand you want a gradient of 90 to 80 on cold side). Is my snake going to be happy enough knowing that she has a warm place to go to? How do UTH users control the ambient temperature in the rest of the tank during the winter?
If you could point me to a good care sheet that describes UTHs better that would be very helpful too.
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