Where should the probe be for the Helix in a cage stack of 3-4 cages using RHPs? My setup atm has the top cage with the probe on the substrate snaked down thru a hole in the top of the Vison cage. I have the Accurite thermometers and they read 91.2 on the hot side and 80 degrees on the cold side. Tempgun says 93 on basking 89 on substrate and 80.9 on the codl side. The middle cage is about a degree warmer than the top and the bottom cage is about 1-2 degrees colder.