The ambient temps are more less the room temp for the most part. I am assuming you have belly heat which is on the floor. I would reccomend running the tstat probe to a spot directly on the heat tape where the tub won't knock it off like on the side of the tub and tape it down real good so it doesn't get moved. Flex watt will vary a bit but in my experience it is most accurate when probe is directly on it on a black bar on flexxwatt. Then I like to run a digital thermometer with a probe inside the tub to check accuracy and dial in my temps by adjusting tstat . Usually the temperature on the tstat will be set a few degrees higher than the actual temperature in the tub. I like to run it overnight to get it to settle in before I feel ready to add snakes.
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