Tetra 50 watt preset heater instructions

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Buy Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt: Space Heaters - Amazon.com ? FREE DELIVERY possible on eligible purchases. Tetra's HT line of heaters are easy-to-use and work in aquariums ranging from 2 to 55 gallons. The heaters have electronic thermostats that automatically Ideal for aquariums of gallons capacity, this 50 Watt aquarium heater is a great way to keep your fish happy. Submersible Heaters Models and HT10 (50 Watts)A good rule of thumb for aquarium heaters is 5 watts per gallon for aquariums 55 The Aqueon Preset Heater will only show an indicator light while it is Designed for 2- to 15-gal tanks, the Tetra Heater 5-15 provides a steady 78-degree water temperature automatically. Just submerge the heater in the water, Tetra Submersible Heater has an electronic thermostat that automatically maintains water temperature. The indicator light lets you know when water is being So I have the 50 watt heater submerged in my 3.5 gallon tank and there's no light on whatsoever. Does that mean the water is at the right temperature?