Review on Submersible Energy Efficient Controller Thermostat Thermometer by Crystal Wilson

Unfortunately I had to give two stars as I bought this for my 2 gallon tank after reading all the reviews and product description. Unfortunately everything was great the first day, worked well (although the top suction kept falling off but the heater was good anyway), until the 2nd day. Woke up and the temperature was TOO HOT for my tank and my fish died. It was the most disappointing incident. Returned the product immediately. Obviously there is no substitute for my fish (since they were a sentimental gift). Yes "Lots of fish in the sea"! But more important was who gave it to me. In any case. Very heartbreaking about it. But it is like that. That being said, I would suggest that this product is worth the cost of large tanks. Maybe 5 gallons or more. Not less.