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Uniclife Aquarium Heater Submersible with Thermometer, 100 Watt for 10-25 Gallon Fish Tank : Amazon.ca: Pet Supplies
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Tetra Submersible Aquarium Heater 100W, HT30 for 10-30 Gallon Fish Tanks : Amazon.ca: Tools & Home Improvement
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Neo-Therm Pro Heater
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Aquarium Heater Size Guide
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