Hey i just registered to this site now as i am having some problems with my racks temps. I built my rack out of melamine board and am using 11" heat tape all wired together controlled by a Herpstat 1. I have the temperature probe on the middle shelf set at 85F and on the top shelf the hot side temp is 95! and the bottom is 78, I am just wondering if anyone knows why this is happening and if there is a way to help the temps even out? because as of now the top two tubs are not usable because of the high temps, any advice is appreciated!