Review on Cobalt Aquatics 31020 5W Mini-Therm Aquarium Heater - White/Black, Energy-Saving Mini-Therm Heater, 5 Watt by Kory Shelton

My daughter has a betta in her 1.2 gallon tank. Before buying this heater, the water was only room temperature, around 70-72 degrees. The poor thing was cold. Now he's much happier with a new thermometer and this 5 watt aquarium heater! I love that this heater can just be plugged in and left alone. It always keeps the water within 79-82 degrees. The price was right too. It worked for 30 seconds right out of the box, no adjustments needed except rinsing it, putting it in water and sucking it out of the way, then plugging it in. I kept a close eye on the temperature for the first few days, and after realizing that it kept the water right where it needed to be, I forgot about it. It is hidden in the aquarium behind a tall plant. The fish is happy, active and even more colorful when it's warm. Highly recommended!