I am very glad to hear that your lesser is doing well. That is awesome. I am very sorry for your loss of Darwin.
I hope it is too early, please accept my humblest apologies.
Please do not take this as criticism I am truly trying to be constructive and reducing your worry. If I imagine myself in your position I would be checking on the enclosure all the time and would not get a good nights sleep. I have had a t-stat fail and caught it before any harm was done, and frantically searched for a solution this is an easy one.
http://www.spyderrobotics.com/home/s...edocument.html