Marina Submersible Aquarium HeaterMarina submersible aquarium heater is designed to provide a reliable heating solution for both salt and freshwater aquariums up to 30 gallons. Easy to use, the heater has numerous features making it safe and convenient even for the first time users. It gives you easy access to temperature set dial, on off pilot light indicator and a bumper guard. It is made of high quality, durable glass made to last under normal aquatic conditions. Works excellently