Hey, would just like to clarify here that ALL AND ANY heat sources should be on a thermostat no matter what. At the very very least there should be a dimmer, closely monitored for fluctuations.
97/85 is much too high. I also sincerely hope that 97 is a hotspot temp and not ambient.
The HOTSPOT underneath the heat source or on top of the glass if using a heat mat/uth (measured with a temp gun) should be 90-91 degrees. Ambient temps (measured with a digital thermometer, not an analog stick on) should not be higher than the mid 80s on the hot side and low 80s on the cool side. I keep mine at 83/80.
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