The NICREW Mini Aquarium Betta Heater is a small, lightweight heater that is perfect for use in fish tanks. With an LED indicator light, it is easy to keep track of the water temperature. The preset temperature has been set to 77 degrees Fahrenheit, which is appropriate for most tropical fish, shrimp, and aquatic plants. The compact design and built-in suction cups make it easy to place in any aquarium. This 35-watt submersible heater works for aquariums up to 8 gallons to provide the ideal water temperature.