This might help you. This is a rack a buddy and I just built. We used Freedom Breeder tubs but its the same concept. We have used melamine for years and have never had an issue with warping. We only had an issue with sagging when we did 4 tubs wide without a support in the middle. Anyway hope this thread I made will help you with your heat tape question.
http://ball-pythons.net/forums/showt...m-Breeder-Tubs
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