Same as topic, I bought this sucker yesterday and put it in the aquarium, it started running and I checked back about 13 hours later and the tank is around 75 degrees, me needed around 81. I have a tank right beside it (10gl) and the other one is running fine at 79degrees and runs on a 50watt. Is the new heater faulty that I just put on this 10gl or what else could be causing this? The indicator light does come on/off and I have the highest setting on but nothing still is changing? I just unplugged it for 15 mins, im gonna let the digital temp on the heater reset to the tanks temp and then put it back in at the average temp around 78 degrees as said on the manual...