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Amazon.com: ZEETOON 25W Aquarium Heater, Automatic Thermostat Betta Fish Tank Heaters, Tortoise Small Water Warmer for 2-5 Gallon Container with 1 Stick-on Thermometer Strip : Pet Supplies
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DaToo Small Aquarium Heater 50W Mini Fish Tank Heater 50 Watt Submersible with LED Temperature Display - Walmart.com
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