possibly, that's why I would suggest getting a UV sterilizer. everything in the tank is fighting for that o2. do you have a wave maker or return nozzle pointed at the water surface to create water line breakage to help get o2 into the waterI do not. The aeration seems to be helping quite substantially actually tho. It seems like my corals are fuller than they have been in months. The fish are still acting somewhat normal and still scavenging and eating well. You think I’ve just been unintentionally starving my tank of dissolved oxygen?