My new snake is coming today. I have cleaned Ralph's old cage out and disinfected it. It has been empty for about a week after the cleaning. I have a small aquarium for now with a sticky thermometer on the side. I know it is warmer on the bottom of the cage. What is the best thermometer to use? I don't want to lose this snake. I don't think my last died because of anything I did, but I don't want to take any chances.