I have some custom ones, Fluckers, and ZooMed. They all have worked fine. For the tub either the Fluckers or ZooMed would be fine. The Fluckers is a plastic sheet that is very thin. They also advertise only getting to 100 degrees. Which is supposed to make them safer. The ZooMed is a tad thicker and more of a rubber mat feel but they are rigid. Just remember to never bent a uth as it will bend and break the inner wires and cause it to malfunction or die.
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