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PULACO 100Watt Aquarium Heater for 15-25 Gallon Fish Tank, Adjustable Submersible Heater Thermostat with Thermometer Strip and Suction Cup

hygger Ceramic Submersible Aquarium Heater, New Explosion-Proof Fish Tank Water Heater with External Temp Controller Auto Thermostat Heater for Saltwater Freshwater (200W for 10~40 Gallon)

HiTauing Aquarium Heater 25W/50W/100W/200W/300W, Adjustable Knob Fish Tank Heater with Digital Thermometer, Submersible Betta/Turtle Tank Heater for Freshwater and Saltwater Tanks

hygger Mini Fish Tank Submersible Heater 50W for 5-10 Gallons Small Betta Aquarium Heater with Digital Display Controller Adjustable Temperature

AQUANEAT Aquarium Heater, 50W Fish Tank Heater, Adjustable Submersible Water Thermostat with Thermometer

hygger Small Aquarium Betta Heater, Submersible Fish Tank Heater 10W/25W/50W/100W with LED Digital Display, Suitable for Marine Saltwater and Freshwater up to 5/10/16/26 Gallon

Orlushy 25W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 1-6 Gallons Freshwater & Saltwater Tanks

AQUANEAT Aquarium Heater, 25W Small Betta Fish Tank Heater, Mini Preset Water Thermostat with a Thermometer