I set up a tub to see how this would work for me... In the glass tank it took both the UTH and the night light to keep the spec right. In the tub at the moment I am only using the UTH and I can't get my temps up. Not sure what I am doing wrong. I was going to use coconut husks like I did in the previous glass tank but it appears that maybe I either put to much in or the UTH is having having issues heating it up. The UTH seems to be working well... feels very warm to the touch and its brand new so I have no idea whats going on. I switched out the substrate to newspaper in hopes that maybe this will help out some... we'll see tomorrow I guess if I can ever manage to get out of work. I haven't moved a snake in yet... I am trying to get this right first.