Orlushy 25W Submersible Mini Fish Tank Heater, Adjustable Aquarium Heater with Digital Display External Controller, Overheat Protection and Free Thermometer for 1-5 Gallon Freshwater & Saltwater TankOrlushy 25W Aquarium Heater: Orlushy 25W heater can work perfectly in 1 5 gallons tank, suitable for aquariums, fish tanks, betta tanks and turtle tanks. The length of this heater is 5. 2 inches and compact in size, which takes up less space and can be easily hidden in the aquarium, keeping your fish tank at most beauty. Safer and More Durable Quartz Glass: This aquarium heater is made of gray quartz glass, which has higher hardness than regular