Aqueon Preset Aquarium Heater requires no adjusting! The preset temperature has been calibrated to 78 F, accurate to a plus or minus 1 degree, appropriate for most tropical fish. It is fully submersible, constructed of shatter-resistant quartz glass and features an automatic safety shut-off to avoid overheating. The heater includes suction cups and can be placed vertically or horizontally within the aquarium. An LED indicator light displays red when actively heating. Variations in room temperature may cause slight deviations in the actual water temperature.
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