I can get a 20l, I am concerned about these heat pads. I am worried about putting that sort of heat on a glass pane for proloned periods. Being that they are designed for this purpose, my fears are prolly unfounded. Are there instances of them cracking the glass, or shorting out? Am I making a mountain out of a mole hill? I tried to speak with the *kids* at the pet store, and frankly, I got the impression they did not know the answers to the questions I was asking.

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