the heating requirements are fairly close corn snakes are 85 and ball pythons are 85-90 so i can set it for 87 directly from thermostat and with flex watt its been reported that the farther the flex watt is from the thermostat the lower the temp will be so lets say i put my ball pythons on top with the top shelf being the first connection the second shelf being connected to the first through wires and third wired to the second that means if i set my temps to 87 the first shelf will be 87 and second would be 87 but the third will probably be 86 or 85 even if its not 87 is a perfect temp for both species