Just because you've been using it improperly for a specified amount of time without problems doesn't mean its OK or that you won't experience problems in the future.
They are meant to be adhered to the bottom outside of the tank. Did it come with a backing to peel off? Could you post a picture of your setup?
The timer its on, does it turn it on and off in accordance with how warm it is? Or just on during the night and off during the day?
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