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

Worked great in my 24 gallon aquatop. Small enough to fit in the rear exit area. Maintain a constant temperature in the aquarium. Why 1 star? 1 disk control means nothing. The numbers do not refer to temperature. I set it to 72 to get 76/77 which is what I wanted. 2 - Within two months I noticed the glass tube was cracked and the internal components were rusty. I threw it away. I don't know about you, but I'm not very cool with faulty electrical components in my reef tank.