Review on hygger 50W Mini Submersible Digital Display Aquarium Heater: Compact, Fast Heating & Thermoregulation for 🐠 Small Fish Tanks, with External Controller & Built-in Thermometer - Ideal for Betta and Turtle Tanks by Carrie Stolhanske

Good heater! It has a nice lid that protects the fish. Keeps my water at a constant plus or minus temperature (depending on how the temperature in my house rises and falls). The heater quickly adjusts the temperature to my settings. It's easy to use and I appreciate the digital display on the front that shows the water temperature. It also shows you the set temperature when you press the button on the power cord once. You can also adjust the setting with the push of a button until you reach your desired temperature. I believe it ranges from the low 60's to the 90's The temp gauge is shown in red.