Review on Fluval M50 Submersible Heater: Reliable 🔥 and Efficient Heating Solution for Aquatic Environments by Amy Smith

I have the 200w option for my 54 gallon goldfish tank in the corner. My goal with the heater is to stabilize the water temperature so it doesn't fluctuate, especially during the cold and rainy season. I like to keep it at 72 and my thermometer reads exactly 72. While the temperature setting is fairly accurate, take out a thermometer to really make sure it's set to what you want (tape doesn't count). Sometimes you may need to play around with the dial. When the heater is on, a very faint blue light is emitted around the center of the heating tube, and when it is off, the blue light goes out. There is a misconception on the Internet that the heater cannot be completely immersed in water. The line exists due to regulations in some countries. My heater is completely submerged and works great. TLDR: This is an amazing heater and you won't be disappointed. Just make sure you have an actual thermometer to make sure the temperature is really right, and get the correct wattage for tank size and other variables.