This 10 watt heater gets pretty hot. It keeps my 5 gallon aquarium at 80Β°F or higher. I have two thermometers there so I'm sure of the temperature. If you have a tank under 5 gallons I would go with a smaller heater. Although I am very satisfied with this heater. I have it under the gravel so you can't even see it; this works very well so far!
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