That's normal. You got to remember, the flexwatt has to heat through the 1/2" PVC too. And heat tapes will not heat the air fyi. So you want to always take the temp from the floor of the cage with an IR temp gun. Also it is recommended to use 1/4-1/2" of substrate. I have my Herpstats set to 100F to get around 90F on the floor with my temp gun in my T10s and my room is kept around 78-80F. I too use one of those tables with a sheet of 1/2" plywood between the table and the cages. Tomorrow though my AP stand should be here. Oh and also be sure to temp gun the whole area. Heat tape is known to not be 100% across the board so you will have some spots a little warmer and some a little cooler. You want to just even it out with the t-stat. Plus the snake will also find his/her favorite spot and usually push all the substrate aside and make nice spot there.
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