Designed specifically for the Dymax IQ Nano Aquariums, the Dymax IQ Spray Bar is used to improve water circulation in your nano aquarium. This spray bar unit helps to increase earation as well as to improve circulation of water in the mini aquarium. As you likely already know, oxygen enters the water of your aquarium through the surface, so a great way to increase the amount of oxygen in your tank is by agitating the surface water of your aquarium. A spray bar is one of the many aquarium products available, such as airstones, that can be used to agitate the surface of your aquarium. The spray bar attaches to your filter outlet and evenly sprays (very gently) water across the surface of the aquarium. As the spray hits the water, it churns the surface, allowing more oxygen to enter the water. Spray bars also benefit your tank by creating water movement, an essential part of a healthy tank. Besides betta and gourami, there are not a lot of fish that happily live in stagnant water.