Sorry, I meant line the sides with heat tape I was a bit tired when I wrote all that and wasn't entirely sure it made sense. Anyhow, I ended up setting up the incubator on Sunday with 2 feet of 11" Flexwatt on each side and installed (1) 3" cpu fan at the moment. So far it only fluctuates +/- .3 degrees using a Herpstat but I do not have any tubs in there yet. I will set up the tubs today and try to get some photos on here before the day is over ... please feel free to critique as this is my first attempt at an incubator and breeding Ball Pythons so obviously I do not want any issues Thanks