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SUNGROW Betta & Turtle Submersible Aquarium Tank Water Heater with Thermostat, 10-watt, up to 5-gal - Chewy.com
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Amazon.com: Aquarium Heater, 5W Fish Tank Heater Mini USB Submersible Heater Aquarium Heating Rod for 0.5-2L Fish Tank : Pet Supplies
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