Keep the 55 dead on at 80, 300 watt heater in the return area of the sump, cooling is automatic with the sump in the basement which stays a constant 65ish, evaporation takes about 2 gallons per day without fans. Now this has been through the summer. The real test will be once the woodstove and fireplace get fired constantly.

The 180 is still cycling at 84*, a temp 200 watt heater is holding it there, waiting for the sump and such to be built.
Why 84? Curious to see if higher temps yeild faster bacteria reproduction, not that I have any way to measure this, just hoping it will reduce the cycle time so we can start populating the tank.