Dont cut the black lines, just cut the clear part in between two black strips. But why are you switching to back heat if you already have belly heat? Imo Belly heat is better as it aids in digestion
The rack uses 3 inch belly heat. the heat tape is fried and needed to be replaced. the show i went to today only had 5 and 11 inch heat tape.
so i am switching for the time being. i have 10 snakes relying on some sort of heat lol !