Aquarium air pumps help keep water moving and air flowing, improving circulation in your fish tank. An air pump is one of the most basic, yet versatile, pieces of equipment that you can purchase for your aquarium. Its purpose is to force air, through mechanical means, into your aquarium. By doing so you create water motion with the rising air bubbles, and also introduce oxygen into the water that your aquarium fish and animals need to "breathe". Air Pumps can also be used to operate ornaments and power filtration equipment.