Tetra 20-Gallon LED Glass Aquarium Starter Kit with Filter, Heater & Plants - Walmart.com
Amazon.com: Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon : Pet Supplies
5 Gallon Mini Inline Fish Tank Heater - Hygger
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Amazon.com: SunGrow Halfmoon Betta Heater, 10 Watts, for Small Tanks, Fully Submersible Aquarium Heater, Automatically Reaches Preset Temperature, Energy-Efficient Heating Module, Suction Cups Included : Pet Supplies