New tortoise owner and trying to figure all this out. I know it needs a basking light for approx 12hrs out of the day.. how warm should it be directly below the area it’s heating? We are using a 40 gallon tank for right now until our new family member gets bigger.. it came with a heating mat that can be placed on an outside side wall to provide general warmth. It would not be in direct contact with our tortoise. Is this needed at night to keep the tank at a certain temp level at night when the light is off?