I have a heat pad but the pet store told me they don't need belly heat so i can stick the heat pad to the side of his enclosure to keep the heat up, so i did that. Do I need to put it under the cage?? I thought I needed to but the lady at the pet store said it wasn't needed because it's unsafe and could cause a fire.

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and also, the heat pad i have is an 8watt heatpad.