I have a zoo-med uth for my glass tank, and I just realized by doing the research that I should hook up a thermostat to my uth... What are some suggestions of reliable thermostats that people are using?? And once I plug my heater into the thermostat, where do I measure my temps at?? Directly on the glass or should I measure the ambient?? Do I need a thermostat with probes? Can I hook up 2 probes for warm & cool sides? How much $$ am I looking at, and where can I purchase one? Sorry for all the questions, I really need clarification.