![Amazon.com: Aqueon Small Aquarium Fish Tank Submersible Mini Flat Heater Up to 3 Gallon Aquariums, 7.5 Watts : Pet Supplies Amazon.com: Aqueon Small Aquarium Fish Tank Submersible Mini Flat Heater Up to 3 Gallon Aquariums, 7.5 Watts : Pet Supplies](https://m.media-amazon.com/images/I/81wKri7aU3L.jpg)
Amazon.com: Aqueon Small Aquarium Fish Tank Submersible Mini Flat Heater Up to 3 Gallon Aquariums, 7.5 Watts : Pet Supplies
![Amazon.com : PONDON 3 Gallon Fish Tank, Glass Aquarium Tank with with Thermometer and Filter, 7 LED Light Colors, Small Fish Tank for Betta Fish Starter Kit (Black) : Pet Supplies Amazon.com : PONDON 3 Gallon Fish Tank, Glass Aquarium Tank with with Thermometer and Filter, 7 LED Light Colors, Small Fish Tank for Betta Fish Starter Kit (Black) : Pet Supplies](https://m.media-amazon.com/images/I/81V+cuEyOPL.jpg)
Amazon.com : PONDON 3 Gallon Fish Tank, Glass Aquarium Tank with with Thermometer and Filter, 7 LED Light Colors, Small Fish Tank for Betta Fish Starter Kit (Black) : Pet Supplies
![Amazon.com: DaToo 30 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 3 Gallon 5 Gallon : Pet Supplies Amazon.com: DaToo 30 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 3 Gallon 5 Gallon : Pet Supplies](https://m.media-amazon.com/images/I/610dnw3x3TL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: DaToo 30 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 3 Gallon 5 Gallon : Pet Supplies
![Amazon.com: Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) : Pet Supplies Amazon.com: Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) : Pet Supplies](https://m.media-amazon.com/images/I/61jO9JRRZQS._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) : Pet Supplies
![SunGrow Betta & Turtle Submersible Aquarium Heater with Thermostat, Electric Heat Controller for Tropical Fish Tank Water Temperature, 10-watt, up to 5-gal - Walmart.com SunGrow Betta & Turtle Submersible Aquarium Heater with Thermostat, Electric Heat Controller for Tropical Fish Tank Water Temperature, 10-watt, up to 5-gal - Walmart.com](https://i5.walmartimages.com/asr/461a09a1-9bcd-4786-8ce8-e9b25f894067.0039c0d3294221fdcf59b0b4ecb03a5f.jpeg?odnHeight=612&odnWidth=612&odnBg=FFFFFF)
SunGrow Betta & Turtle Submersible Aquarium Heater with Thermostat, Electric Heat Controller for Tropical Fish Tank Water Temperature, 10-watt, up to 5-gal - Walmart.com
![Amazon.com: DaToo 25W Mini Aquarium Heater Betta Small Fish Tank Heater Submersible 3 to 5 Gallon, 1 Yr Warranty : Pet Supplies Amazon.com: DaToo 25W Mini Aquarium Heater Betta Small Fish Tank Heater Submersible 3 to 5 Gallon, 1 Yr Warranty : Pet Supplies](https://m.media-amazon.com/images/I/61Xd9SF6DDL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: DaToo 25W Mini Aquarium Heater Betta Small Fish Tank Heater Submersible 3 to 5 Gallon, 1 Yr Warranty : Pet Supplies
![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 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](https://m.media-amazon.com/images/I/51VdEp3BDYL._AC_UF1000,1000_QL80_.jpg)
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
![Amazon.com: DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon : Pet Supplies Amazon.com: DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon : Pet Supplies](https://m.media-amazon.com/images/I/61eodQ-Ha5L.jpg)