Just checking on my tank and found the reefkeeper said the water temp was 85, my water is never that hot , it always stays at 80. So the reefkeeper had the fan gowing to cool it down, I felt the water , it didnt fel warm. I have my heater pluged into my reefkeeper to turn on when the reefkeeper says water is over 80, so of course my heater was turned off and I could not get a temp reading from it. So I unpluged the heater from the reefkeeper and pluged it into a regular outlet , it read 75. So my reefkeeper not only was displaying the wrong temp but was turning my fan on to cool it more . I thought I was safe with the heater pluged into the reefkeeper, two temp probes instead of one, boy was I wrong. So now i will leave the heater plugged into outlet untill the reefkeeper gets fixed. I think I will get a third temp probe now with some kind of alarm.