Quote Originally Posted by AKA Reptiles View Post
I was having the same issue when I built my rack then I realized that the top tub had heat only from the bottom since there was no shelves on top. I fixed this by adding a small strip for back heat only on the top shelf. That fixed my problem. If not you may also want to try insulating the back better to try and trap heat on the top shelf. Can you post some pictures of you build?
Wow I can't believe I hadn't thought of this lol. The shelf having the issue is the top one where there is only flexwatt underneath the tub. The other shelves have it underneath and down one side. I don't have any pictures of my setup that would show the flexwatt set up very well but this is what I built.