high temp without heater or lights!!!

[fresh]

Hi all,

I just noticed that my tank's temperature is at 81.5 F without my heater being plugged in or even my lights on!!!

Is this normal??? My guess is no!!!

I have 4 power-heads plugged in with a remora-pro protein skimmer with the mag350 pump.

I noticed that my tank's temp goes down as my lights go on because I have a clip-on fan that operates during "day-time" hours. My tank's temp drops to about 79.5 F

What can I do as I am getting a bit worried.

Thanks