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Amazon.com: Hydor Betta Bowl Slim Fish Tank Heater, 15-watt, measures 3 3/16 x 6 1/8 inches oval, black; For tanks 5-10 gallons : Pet Supplies
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Ultra-thin 7.5w 15w 25w Aquarium Mini Heater Flexible Fish Tank Turtle Heater Water Tank Heating Temperature Controller 220-240v - Temperature Control Products - AliExpress
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Amazon.com: AQQA Small Aquarium Heater 15W/25W/50W/75W/100W Submersible Fish Tank Heater with Intelligent LED Temperature Display and External Temperature Controller for Betta Fish Tank and Turtle Tank : Pet Supplies
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