Abustle pig Mini Aquarium Heater,25W/50W Small Submersible Fish Tank Betta Heater Thermostat with Free Thermometer Sticker, Under 6 Gallon Fish Tanks (25 W) : Amazon.ca: Pet Supplies
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YukiHalu Small Submersible Aquarium Heater, Adjustable Mini Fish Tank Heater 25W 50W 100W 200W 300W with External Temperature Controller, LED Display, Used for 5/10/20/40/60 Gallons (25 Watts) : Amazon.ca: Pet Supplies
Fluval P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts : Amazon.ca: Pet Supplies
25W Smart Mini Aquarium Heater, Betta Fish Tank Heater Thermostat Warmer Submersible Anti-Explosion/Energy-efficient Water Temp Controller | Walmart Canada
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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
Fluval P25 Submersible Aquarium Heater for Up to 6 Gallons, 25 Watts : Amazon.ca: Pet Supplies
Penn-Plax Cascade Heat 7-Inch Aquarium Heater 25 Watt for 5 Gallon Tanks : Amazon.ca: Pet Supplies