Aquarium Air Pumps

Inexpensive air pumps can be found in any aquarium shop. Your air pump should sit above the aquarium, if possible, to avoid any backflow of water if the power is shut off. You may want to get a valve to control the air flow. Placing a single valve in line with the pump restricts the flow, but it also makes the pump work harder. It may become noisy and will require more frequent replacement. Instead, use a dual valve. Connect one to the airstone in the tank and use the other to bleed off excess air pressure into the atmosphere.