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Zoo Med BettaTherm Mini Size Betta Bowl Heater
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SunGrow Betta & Turtle Submersible Aquarium Heater with Thermostat, Electric Heat Controller for Tropical Fish Tank Water Temperature, 10-watt, up to 5-gal - Walmart.com
Betta Fish Tank Heater with Thermostat - Hygger
25W Mini Aquarium Heater Betta For 1-12 Gallon Small Fish Tank Heater For 1-12 | eBay
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