When I am looking at the Apex display I can see the temp fluctuating from 77.5 to 77.7 to 77.4 and keeps changing rapidly. I know these are only small changes but wasn't sure if that was normal to see and if it would affect heaters turning on and off since I have my heaters turn on at 77 and off at 78. If it is fluctuating around 77, such as 77.2 then 76.9 then back over 77 it would be turning the heaters off and on over and over. I have the temp probe in one of my overflows. Is this normal to see or should it be more constant?