DaveK said:I'm really surprised you need 600w of heaters to keep the tank at the temp you want. For years I ran a similar setup, and a 250w heater did just fine, and the tank was in the basement. Of course, such an arrangement will work, but I think it's a lot more than needed.
I do like the idea of using a controller to operate the heaters. Thermostats is most aquarium grade heaters are terrible, and often prone to fail in the on position.
calaxa said:Yeah, 60 degrees is really making those heaters work. Have you tried insulating the sump somehow? Or at least on 3 sides?