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Well that is a first, glue it to a board ????? HEH
I personally would recommend just putting it directly under the tank or tub. As mentioned dont cover the complete bottom of the tank with the heat mat.
You dont need to run a thermostat, as most heat mats maintain a temperature of 34 touch temp. Combine this with thermal transfer and loss and most a pretty much fine to just go straight under.
If it is getting too hot, you can easily just put a towel between the tub and the mat for further insulation.
I have never had a heat mat element break, something laying flat under a tank isnt going to break, so i dont really see the need for glueing it to a board etc.
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