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You don't enjoy being in water that's too cold or too hot for comfort, and neither do your fish. If the water in your tank is too cold, it leads to a slowed-down metabolism for your fish. This results in them becoming sluggish and sleepy. If the water in your tank is too warm, it leads to a fast metabolism. This results in fish being a little too lively and hyperactive. Tetra HT30 100 Watt Submersible Aquarium Heater has an electronic thermostat that automatically adapts to keep the water at a perfect temperature. It features an indicator light to let you know when it's running and heating the aquarium. The heater will also shut off automatically if there's an electrical short, ensuring everyone's safety. This heater is ideal for 10-30 gallon aquariums. Features: Electronic thermostat Automatically adapts Keeps water at a constant temperature Indicator light Automatically shuts off if there's an electrical short Ideal for 10-30 gallon aquariums