Review on 🐠 hygger Controllable Aquarium Heater: Submersible Quartz Thermostat for 10-60 Gallon Tanks - Ideal for Fresh & Salt Water - Built-in Thermometer Included by Lisa Green

Very happy with this heater. Compact design, and best of all, it only turns on after the water temperature has dropped 1 degree Celsius (2 Fahrenheit). what professional fish farmers recommend so that the heaters last for several years. Otherwise, if they turn on every 20 minutes, the heaters usually slow down for a year or two. The only small negative are the suction cups, which aren't the strongest but haven't fallen off yet.