Review on UL Listed NICREW Preset Aquarium Heater with Submersible Electronic Thermostat for Fish Tanks by Angie Williams

It's quite cold in my house, about 65 degrees Fahrenheit, because it's a compromise between me, who loves the cold, and my family, who loves the cold loves is. a little warmer. At night we lower the temperature by 2-4 degrees. This heater was enough to keep our 20-gallon tank in the 70-80 degree range even in the mornings before turning the heater back on. So far our fish don't seem to be tense at night, but a few degrees difference, which is very important because a dead or lethargic fish is no fun.