i have a 300W heater in my sump, the temp in the main tank is about 83-85. the heater is set at 71 degrees... could there be a reason for this? should the heater not be in the sump? there is only about 5 gallons of water in the sump at any time. but it does cycle through. the heater does turn on some of the time. i let the heat stay at 80 somthing because i am treating for ich but when i am done, i would like the temp to come down... maby there is too much running water over the heater? or its cooling off going through the wet/dry?