I actually bought a BP from the same breeder and they said the same thing to me. I ignored what they said about sealing the top of the tank with that ceramic light fixture. Also I ignored what they said about keeping the humidity at 80% (BP care posts here state 70% for shedding 50-60% otherwise) since I figured it's a desert snake why would it need that much humidity unless shedding. I think the only issue i'm currently having is keeping the air temp in the cage high considering it's getting colder where we live. My snake has been a dream of one minus his escape not too long ago but he's healthy looking and eating well. As for securing the thermostat probe I ran a wire though the top of the cage and placed it under the substrate right above the heat source and it works fine. For temp monitoring I got a humidity/temperature combo gauge to measure air temp and humidity. PM me if you like it would be nice to get to know more snake owners where I live.