thanks rr, i was thinking the same thing, bubbles are very hard on corals, plus the salt creep, too much air in a sw tank is not good, like in a fw tank, and if you are using air stones, DEFINTIELY take them out! please, if you want to aerate the water, try adjusting power ehads and you r skimmer, in addition to the natural exchage from the dsb and plant life is all that is needed and EVEN RECCOMMENDED(with reason)