This may sound silly but what happens when you put them in a tank, i hear they only lookk good in marrines, i was just wondering as my ttanks in my room and the airstones sometimes keep me awake (awwwwwwwwwwwwwwwwwwww)
I think the things you speak of are the same as airstones, just made from wood. you would still need the pump, which is what makes that noise. Unless i'm thinkin of the wrong thingy? just get a quieter pump, or you can get longer hoses and move the pump somewhere else.
its not the pump its the bubbles gpoing pop on the surface... i was just wondering if it did that cool thing that the wooden diffusers do in salt water thats all, im thinking of just getting a powerhead to bl;ast water in
ok cheers, i just thought if it would work then it would look good, the small msuky air bubbles if you have seen them you will know what i mean :S I HOPE!