Aqueon Mini Heater provides warmth to tropical fish. Designed with a shatterproof housing and thermal safety shut-off, this compact and completely submersible mini heater is perfect for desktop aquariums with a minimum size of 2.5 gallons and up to 5 gallons. This heater is also able to be used in both acrylic and glass aquariums. It can be installed vertically or horizontally to fit different aquarium design and the shatterproof construction adds peace of mind with an extra level of safety. Aqueon products offers a wide range of items so that you can build and maintain a healthy aquatic environment. All the essentials from fish tanks, filters, lighting, food, care, and other supplies that your pet fish needs. We make it easy for you to get your first aquarium and to grow in the hobby as you become more of a fish expert with every step you take and every new thing you learn. For those seasoned hobbyists, we are committed to aquarium product innovation so that we continue to offer products that get you excited. With the Aqueon brand, it's all about the fish.