Having used this heater for over 6 months I can safely conclude that it is very poorly designed and can be deadly. In my case, I was constantly trying to keep the water temperature at the right level by turning the knob and then checking my thermometer again. One day while I was cleaning my aquarium, it seemed like the handle kept turning a little too high and all my fish were frying. Now I know it was accidental, but the system must have a safety shutdown, the internal sensor temperature is over 85F. No tropical fish and very few marine fish can survive at this temperature. In my case, I woke up to an aquarium full of dead fish. Use my review as a word of caution if you don't want to be constantly manually checking the temperature and could one day wake up with DEAD fish.
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