Review on Enhanced Fluval P Series Submersible Aquarium Heater for 15 Gallon Tanks by Joy Miller

I recently purchased this heater for my 5 gallon hospital aquarium. It was placed within 3 inches of the moderately flowing filter water stream. The temperature of the tank constantly fluctuates between 76 and 82 degrees over a 24-hour period. (The room temperature was 72-75 degrees.) He continued to work in this way for a week. Fluctuating water temperatures stress your fish and make them ill. I would not recommend using this heater model.