Review on Energy-efficient Betta Heater for Small (1.5 gal.) Tanks - Fully Submersible Aquarium Heater – Automatically Reaches Preset Temperature – Easy Installation with Suction Cups by Kimberly Elliott

This heater is awesome! Betta need heaters. I didn't realize how much it cost until I bought this one. I put it in its 1.5 gallons. Buck, hooked up and in half an hour my fish was already swimming and not lying in the corner. I've been using this heater for a few days now and I'm very happy with the result. He revived my fish! I keep my house at 70 degrees, it's not warm enough for betta to be happy. If you love your fish, give them this heater. It's well done. When it heats up, the red light comes on and everything is set automatically by the built-in thermostat, so you don't have to adjust the controls.