Been fighting a small amount of hair algae in my 40 breeder so I cleaned all equipment, did a nice water change, turned off lights and covered the tank with a blanket. Did 3 days lights out which are 2x150 halides. I go to turn on the lights end of day 4 and realize heater is unplugged and panic for a second before seeing that everything is fine. Temp is 75, normally 77 but all stonies and softies are doing great. It gets cold in my house too but the heat retention of the tank sure surprised me.