Actually I bought the tank used and the UTH was already stuck on, so I just spent most of an hour peeling it off haha
I agree, it wasn't fun!

But I didn't like where it was already, even if I use both, so now I can put the two wherever I want.

If I have one ZooMed, and one piece of flexwatt (the 11") which should be the hot side and which should be the cold- or would it not really make any difference?
I probably should try with just the heat tape and see if I can get it to work better like that.