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Zoo Med BettaTherm Mini Size Betta Bowl Heater
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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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Amazon.com: DaToo 10 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 1 Gallon 1.5 Gallon : Pet Supplies
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Aquarium Fish Tank Heater Submersible Heating Rod for Turtle Betta saltwater and freshwater Pet Feeder Pond - Walmart.com
25W/50W Mini Aquarium Heater Betta Fish Tank Heater For 1-5 Gallon Small Tanks | eBay
