Aquarium Heaters – Marine Depot The proper aquarium heater size is minimum 3-5watts/gallon, so a 10 gallon aquarium heater will usually be 30-50 watts. A large aquarium heater may be closer to 3w/g. We recommend using multiple … The Best Aquarium Heaters of 2020 (Reviews & Top Pick) There are many reputable heater manufacturers that […]
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