An aquarium device is a combination of items used to maintain a healthy aquatic environment. An aerator, which is seven letters long, is used to oxygenate the water and keep it clean. A TANK, four letters long, is used to contain the water and the fish. ALGAE, five letters long, is a type of plant that can be found in the water and provides food for the fish. Tetra, five letters long, is a type of fish that is often kept in aquariums. Tetras, six letters long, is the plural form of tetra. Danio, five letters long, is another type of fish that is often kept in aquariums. All of these items are essential components of an aquarium device.