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The Hydor Theo Aquarium Fish Heater sure does bring the heat! This submersible and shock-resistant heater can help your fish friends thrive in your aquatic setting. It comes with a suction cup that allows you to place the heater wherever is most convenient for you—horizontal, vertical or diagonal! This convenient tool has an automated control feature that helps sense any abnormal functioning in your tank’s heating so it can precisely maintain the temperature.