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Amazon.com: AquaMiracle 50W Small Aquarium Heater Submersible Fish Tank Heater Betta Heater, Easy Operation with Preset Temperature 78℉(26℃), for Tanks up to 10 Gallon : Pet Supplies
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Amazon.com: PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks (Preset Temperature 78℉) : Pet Supplies
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PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks (Preset Temperature 78℉) - Walmart.com
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Is Your Betta Warm Enough? The Best Aquarium Heater for Bettas! My Experience, and my FAVORITE - YouTube
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