DaToo 25W Mini Aquarium Heater Betta Small Fish Tank Heater Submersible 3 to 5 Gallon, 1 Yr Warranty : Amazon.ca: Pet Supplies
hygger 50W Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible Betta Fish Tank Thermostat for 5-15 Gallon : Amazon.ca: Pet Supplies
hygger Small Submersible Aquarium Heater 25W Mini Betta Fish Tank Heater with Thermostat for 2-5 Gallon Saltwater Freshwater : Amazon.ca: Pet Supplies
Aquarium Heaters - Fish Tank Heater | Aqueon Aquarium Products