10x Air Stone Bubble Curtain Bar Aquarium Aerator Pump Hydroponics 4 Send a torrent of air bubbles cascading from your aquarium bed with this aquarium bubble bar. Just attach to your air pump with standard airline tubing and you'll create a decorative curtain of tiny bubbles that helps agitate and aerate your aquarium water. Great for freshwater, saltwater/reef aquariums and hydroponic use Increase oxygen levels, "blow off" CO2 and raise pH Fits standard air line tubing aquarium and CO2 tubing with inner diameter of 4 mm