So I have a 50 gallon tank with a 30 gallon sump. I have 3E Heim 150 watt heaters set at 79° and my tank is down to 72.4. That's the lowest it has gotten lights are off at the moment. I have not changed anything in the heaters. All show that they are on anyone. Know what the f*** is going on before everything crashes? What am I doing wrong here? Please help