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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 15W (for 1-5 gallon)
Marina Betta Submersible Heater for Aquarium : Amazon.ca: Pet Supplies
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3 Best small aquarium heaters for tiny tanks 1 - 10 gallons
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Fluval 25-Watt Aquarium Heater for Nano Fish Tanks | Mini 25W Heater – Aquarium Co-Op
Amazon.com: PGFUNNY 25W Aquarium Heater, Fish Tank Heater for Betta Smart Thermostat, Slim Design Fit 3 to 5 Gallon Tank, with Thermometer Strips : Pet Supplies
