Quote Originally Posted by SlitherinSisters View Post
I would use 11'' for 41 quart tubs. 4'' is going to be way too small, the snake will have a very small space to lay on if she wants to be warmer. Plus if you only have 4'' flexwatt you will probably have to heat your room a lot more to keep the cool side from dropping too low.
I actually am doing a similar project and was deciding between 4" vs. 11" as well. My additional question based on the 11" concensus....how long ? I'm thinking about 7-8 inches because that would be about 30% of the floor length of a 41qt. Sterilite tub. Is that about right ?