Please remember to check your tank's temperature and adjust accordingly. We've had quite a run of hot weather and things can get strange when the temperatures rise. My sump will get cooled off better in the summer thanks to the flow of my AC and I have to adjust the thermostat in my heater down a bit to maintain my thanks summertime temp of 79°. It's a little on the high side but that's where it's stable. If you find it running a little warm (80°+) I would suggest a small fan be put to use for evaporation cooling.