Eheim jager heater calibration question
So I just got a new Eheim Jager heater because my old one stopped working. I set the temp to 26 Celsius and turned it on. Overnight the temp of the tank reached 28.7 (tested with two thermometers). It’s autumn here so the ambient temp is cool, and shouldn’t contribute to the increase in temperature. I know the instructions tell you to wait 1-2 days before calibration, but I don’t want to risk frying up my fish as the heater light is still turned on. Will it ok if I re-calibrate right now?