Aquarium Heaters Glofish
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 | AQUARIUM HEATER: Submersible heater is designed to keep your aquarium at the optimum temperature. AUTOMATIC THERMOSTAT: Electronic thermostat keeps water at a consistent 78 degrees. INDICATOR LIGHT: The red light shows when water is heating; green indicates that the heater is on standby. EASY TO USE: Just attach to an aquarium wall - the suction cup securely attaches heater to tank. SIZE: Use this 50-watt heater for aquariums up to 10 gallons - UL Listed. | GloFish Preset Aquarium Heater, 50W |  |