The Ultratherm heat pads I got from The Bean Farm have instructions that say you can cover them with 6mm (1/4") Polystyrene Board

For the purpose of directing the heat up thru the tank.

Lowes and Home Depot have no such stuff unless it's a $50.00 roll of the fanfold stuff 50' long.

I have a roll of Reflectix, (the foil bubble insulating stuff) I would think I could cover the heat pads with that. It should serve the same purpose shouldn't it??

As all heat pads are run with a thermostat, and they are on metal racks like this https://www.petco.com/shop/en/petcos...and-40-gallons so it is vented and not a solid surface, I don't forsee any over heating problems.

Any thoughts on this? Don't want to burn out a heat pad or crack a tank if I can avoid it.

Thanks for any input.