I have a couple side questions to rack or non-rack system. I am getting ready to build my own rack and I see most people use "heat tape". I've gone to every local pet store and hardware stores in town and no one has them. Ive looked online and I've found ppl that sell it by the foot and comes in 3, 4, 11, and 12 inches wide. What width do most ppl use on their racks? Do you run one stripe of heat tape throughout the entire rack, or start a new one for each row? This is the first time building a rack little alone I've never seen a home made on before. Are there any tips or tricks to make it more efficient and easy to build? Any idea are greatly appreciated! Thanks