I'm looking at building my first rack with tubs sized 22-1/2"L x 14-3/4"W x 5-3/8"H purchased from The Container Store. I'm going to house my budding collection of babies and yearling BPs. It will likely be 2 columns of 8 or 10 side by side. I can't decide what size flexwatt tape is needed. For my belly heat would I need 2 strips of 3" or 4" or 1 strip of 11"? Also is animalplastics the only place to get it? I know I'll get my hides from there. Help me out here rack owners.