What Thermostat Do You Recommend?

[Bellabob]

What exactly do you mean all the hotspots? Do you mean to control the warm spot in each slot of the rack?

The rack you are building, is it going to be 1 long strip of flexwatt going through each slot in the rack? If so you just need a thermostat with 1 probe, make sure you secure the probe well to the flexwatt, if it comes detached from the flexwatt the thermostat will crank up the heat since the probe is taking the temperature of the air above.

I would recommend either a Reptile Basics Vivarium http://www.reptilebasics.com/thermostats
Or the Herpstat http://www.spyderrobotics.com/products/herpstat.html

What kind of fail safe do you mean?

Each shelf is going to have one 11 inch flexwatt. I'm using 41Q tubs and my colubrids are going to be in a 21inch by 3 foot deep by 16 and a half inches wide. I will build a seperate one for the 2 BP's that will be 1ft high by 3 feet long by 16 and a half inches wide. So each peice of tape is going to be seperate.

By fail safe I mean that it a shortage happened or somehting happened with the electricity the thermostat will turn off right away.