Amazon.com: Aquael Ultra Aquarium Heater - for Freshwater and Saltwater Aquariums (75 Watt / 9-20 Gallons) : Pet Supplies
Amazon.com : Cobalt Aquatics Neo-Therm Pro Aquarium Heater (75 watt), Fully-Submersible Freshwater, Saltwater, Thermostat, Thermometer, Shatterproof : Pet Supplies
Amazon.com: FREESEA Aquarium Fish Tank Heater: 75 Watt Mini Submersible Water Heater with Digital Temperature Display - Adjustable External Controller for Betta | Turtle | Goldfish | 5-15 Gallon : Pet Supplies