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Hygger Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible Betta Fish Tank Thermostat 50W - Walmart.com
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Amazon.com: Hydor Betta Bowl Slim Fish Tank Heater, 7.5-watt, measures 3.5 inches round, black; For tanks 2-5 gallons : Pet Supplies
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