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(More customer reviews)I have a 20 gallon freshwater fish tank and this little heater does the trick. Keeps the temp at a nice consistent level. The only problem is that, on the unit I received, the temperature that it is set to is about 2-3 degrees colder than the actual temperature it heats the tank to. If temperature is a crucial factor for you, be sure to have a reliable thermometer in your tank so you can properly calibrate the heater.
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The Aquarium Systems Visi-Therm Submersible Heater is completely waterproof and submersible, and the best mix of accuracy and price on the market. It features a visually adjustable temperature regulator and an easy to adjust dial for maximum control and ease of use. An extended-life power lamp indicates on and off cycles of the heater, so you can tell at a glance if the heater is working. The non-ceramic element supports make this heater unusually light which prevents suction cups from pulling loose. Designed for use in both freshwater and saltwater aquariums. Extremely accurate magnetic switch for precise temperature control. Mounting brackets and 2 suction cups included. Size: 10"long, 100 Watts (For aquariums between 15 - 30 gallons)
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