haha, understand the thread topic, but he could of said tub, rack system, sterilite, enclosure to me means anything with an animal in it, melamine, rack, wood etc... the OP seems new to the hobby and could be thinking the same thing. so I wanted to make sure we were extra clear on the topic. I do not place flexwatt in the tub. Perhaps I could have worded it better or they came out with some floating flexwatt.
We are getting off topic of the original post, I offered my advice. Maybe you could offer the OP some advice you have acquired on the subject.keep the UTH of flexwatt on the "floor" and not attached to the bottom of the tub.