Can I attatch my ZooMed Heat pad directly to tub?

[Slim]

Whether or not it should be used is up to the owner.

Thank you for that clarification. It was not clear to me from your posts.

I don't recommend placing a thermostat probe directly on a heat pad.

This is a separate issue, and one that's been debated at length here before. For me, where you put your thermostat probe is a less critical issue than whether or not you use a thermostat to regulate a heat source.