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Provide your underwater buddies with the warmth they with the Tetra HT40 Submersible Aquarium Heater & Electronic Thermostat. This low voltage thermostat maintains water at 78 degree F without any adjustments and features red/green indicator lights to let you know when the heater is heating or on standby. The heater is also fully submersible and can be installed vertically or horizontally. For use with 40-55-gallon aquariums, Tetra HT40 Submersible Aquarium Heater & Electronic Thermostat makes sure your tank is always at a comfortable temperature.
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