I took pictures just yesterday.
It might/should/could possibly look like this on the bottom of your tanks.
If these pads aren't there but you have switches, the pads fell off.
I have a set of pads I bought on amazon by searching:
Car seat heater.
Came with four pads and two switches for $17.
They will roast a turkey on the high setting.
Two speeds, all the wiring.
Will work fine on a tank if tank pads are marked up too high.
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