Description: Produce clouds of micro-fine bubbles and maximize oxygen levels in aquarium water. Ideal for protein skimmers or for dispensing CO2. Suctions to inside of aquarium with included suction cup. Has anyone ever used one of these? Heres the link..http://www.petsmart.com/global/product_detail.jsp?PRODUCT%3C%3Eprd_id=845524441811420&FOLDER%3C%3Efolder_id=2534374302030044&ASSORTMENT%3C%3East_id=2534374302023693&bmUID=1163127095788&itemNo=6&In=Fish&N=2030044&Ne=2
I use those particular ceramic airstones in my waterfarms all the time. With the right pump they produce very well. Soak in hydrogen peroxide between grows and they last indefinitely. I find them much better than the regular airstones.