So my old Eheim 100w heater was starting to get very inconsistent after a very short time, so i decided to go out and buy a new one yesterday afternoon. I put it in my biocube 32 (that is still cycling) and set it to 77. When i got home from work, the temperature of my tank was at 90 degrees! Thank god it was still in the cycling process. The heater was off so much, that i can't even calibrate it to the right temperature as there is a stop on the heater that only allows so much. Be careful with these heaters and make sure you calibrate them before putting them in the tank.


