Panaw are sit and wait predators an also subtropical. I would leave it in the 2' by itself and let it cool a little bit. You will get much more from it like this rather than permenatly hiding from the terror.
I have four of these. From the investigation I have found that they are subtropical, Slightly warmer than some. They live in sheltered water ways and like pretty much all Snakeheads like a well planted tank with some surface cover. A cave or pipe will be good for him to setup home.