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Amazon.com: AquaMiracle Adjustable 20W Small Aquarium Heater Submersible Fish Tank Heater Betta Heater Turtle Heater Super Mini Aquarium Heater with Digital Display Thermostat, for 2-4 Gallon Tanks : Pet Supplies
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Amazon.com: Kaiyopop Mini Aquarium Heater for Fish Tank Submersible Small Heater with Intelligent LED Temperature Display and External Controller for Betta Fish Tank and Turtle Tank (100W) Red : Pet Supplies
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Amazon.com: hygger 300W Aquarium Heater for Fresh-Water Salt-Water, with External Digital Display Thermostat Controller and Thermometer, Auto Quartz Submersible Heater for Fish Tank 30-60 Gallon : Pet Supplies
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