its on a glass aquarium and i've tried it in several different outlets and it wont produce any heat... even took it off the therm and plugged it straight into the wall, nothing.
You can peel it off, try using a little soap and water as you peel it. Just be careful a lot of those are very sticky and you don't want busted glass all over the place.
Peel it off and clean the area well. When you get the next one I don't recommend sticking it to the cage. If it doesn't press against the glass I would simply put a piece of cardboard under it.