We're building a rack (well my bf is building it for me) that can can either fit 2 16 qt tubs, or one 32 qt. tub per shelf. The width of the shelf is about 24", the shelf depth is about 17".

The snake room is a pretty consistent temp hovering around about 80 degrees. The shelves are pretty shallow so I've decided to go with back heat.

I have some 11" flexwatt that I can use along the back wall of the rack.

My question is should I use two 11" panels of flexwatt on the back, or will just one running down the center provide enough heat?

Any advice is greatly appreciated.