Maybe try this...? My heater is set at 80 degrees. On my tank I have two fans, one is a 4-fan strip, and the other is a small but powerful Honeywell table top fan. The Honeywell is always on high, and brings fresh air from the living room onto the sump. The fan strip is mounted on the edge of the sump, and is on the same timer as the lights. My tank is considerably smaller than yours, but this setup keeps my tank at 80 at night and 82 during the day. I would like to keep it under 80, but if I set my heater to 78 the temperature will fall to 78 at night, but still go up to 82 during the day, so i keep the swing smaller by setting the heater a tad higher.
The way I see it, using a temperature controller to control a fan is a waste of money. You know the tank will get warm when the lights come on, so why not put the fan on the same timer the lights are on? Also, the fan will not likely cool the tank too much, and if it does your heater will take up little electricity.
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~ Mindy
SPS fanatic.
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