I think these airstones work great and thats all I said. Im tired of people looking for a way to put down peoples shit instead of going, oh that might work pretty well. An open air line wouldnt create as much surface agitaiton. Give me a break dude. Im not tryin to OUT DO you. chill. I wont have to replace my airstone for years to come. Thats something I think is worth it. Try em out people. Peace