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Amazon.com : Hydor Theo Shatterproof Aquarium Heater, 25-Watt & Ideal For 2 To 7 Gallon Fish Tanks, 7-Inches Long : Pet Supplies
FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer : Amazon.ca: Pet Supplies
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Amazon.com: Betta Fish Tank Heater, 25W Mini Aquarium Heaters Free 2 Artificial Plants 1 Stick-on Thermometer Strip 2 Suction Cups, Water Warmer Temperature Controller Smart Thermostat for 3-5 Gallon Tank : Pet Supplies
Penn-Plax Cascade Heat 7-Inch Aquarium Heater 25 Watt for 5 Gallon Tanks : Amazon.ca: Pet Supplies
Penn-Plax Cascade Heat 7-Inch Aquarium Heater 25 Watt for 5 Gallon Tanks : Amazon.ca: Pet Supplies
3 Best small aquarium heaters for tiny tanks 1 - 10 gallons
Marina Submersible Heater for Aquarium, Mini, 25-watt : Amazon.ca: Pet Supplies
Giant Electric Water Heater - 5-gal - 3000-Watt - 240-Volt - Residential 106SEO-3R5M | RONA
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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
Uniclife Aquarium Heater Submersible with Thermometer, 25 Watt for 5 Gallon Fish Tank | Walmart Canada
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hygger Small Submersible Aquarium Heater 25W Mini Betta Fish Tank Heater with Thermostat for 2-5 Gallon Saltwater Freshwater : Amazon.ca: Pet Supplies
YukiHalu Small Submersible Aquarium Heater, Mini Fish Tank Heater 25W 50W 100W 200W with Built-in Thermometer, External Temperature Controller, LED Display, Used for 5/10/20/40 Gallons 25 Watts
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Fluval 25-Watt Aquarium Heater for Nano Fish Tanks | Mini 25W Heater – Aquarium Co-Op
Amazon.com: Betta Fish Tank Heater, 25W Mini Aquarium Heaters Free 2 Artificial Plants 1 Stick-on Thermometer Strip 2 Suction Cups, Water Warmer Temperature Controller Smart Thermostat for 3-5 Gallon Tank : Pet Supplies
3 Best small aquarium heaters for tiny tanks 1 - 10 gallons