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YukiHalu USB Powered Submersible Aquarium Heater, 10W/5V/2A Adapter, Mini Fish Tank Heater 10W with Built-in Thermometer, External Temperature Controller, LED Display, Used for 0.5-1 Gallon Tank : Amazon.sg: Pet Supplies
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Evjurcn Aquarium Heater 10W Mini Fish Tank Heater with Digital Display Thermostat Adjustable Temperature 64~93°F Set Arbitrarily 5V/2A USB Powered Automatic Power-off for 1 to 5L Tanks(Black) - Walmart.com
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