Interpet airvolution 2 is a brilliant aeration pump for your aquariumr the pump will ensure there is movement of water to prevent stagnant water areas forming keeping the fish and aquarium life healthy particularly overnight when the planted aquaria expel more co2r the airvolution 2 air pump is very quiet compact and high performancer air flow is 200 lhrr can support 1 x 18 air well or 4 ornaments or a 36 under gravel filter