My main concern is that the bubbles are not good for the tank. You all seem to say they are fine, but for appearance they suck.
I completed took apart a seaclone, and made my own skimmer out of it, and when I up the airflow, I get sweet contact time in the skimmer, but some of the bubbles get sucked back into the tank. I'm fine with the bubbles, because the skimmer is pulling sweet gunk. I just don't want the bubbles to be harmful to the tank.
I'm thinking of making adjustments to the skimmer, and put some kind of foam block on the exit of the skimmer or with in the outer tube of the skimmer.