Hi, i have a 120 gallon tank i was wondering about the heaters i have two 300 watt heater one controlled by inkbird conteoller, but my sump smells when i open the doors, and my leaving room smells like sometimes, is this due to the heaters been in the sump and enclosed in a 30 gallon sump, has anyone run into this issue please help, i due water changes every week but it smells not always but it does, one is on the side the other in the rear