AQUANEAT Aquarium Heater, 300W Fish Tank Heater, Adjustable Submersible Water Thermostat with Thermometer

The AQUANEAT Aquarium Heater, 300W Fish Tank Heater, has received mixed reviews from customers. One user expressed extreme dissatisfaction, reporting that the heater failed to heat a 20-gallon tank to the desired temperature and resulted in the death of fish. Additionally, they mentioned that the heater holders deformed after only two weeks of use and rated it as "junk." In contrast, another user found the heater to be effective in their 30-gallon tank, particularly during cool nights. However, a different customer was disappointed, stating that two 300W heaters did not provide the expected wattage and were actually Consuming significantly less power. Furthermore, they highlighted that the heaters were prone to floating to the surface if the suction cups failed, posing a potential danger to the tank inhabitants.