Originally Posted by h8z2luze
I used that sump design and have no micro bubbles.
Same here. I used nearly the exact same type of sump design as this for over 10 years, even had an air driven skimmer which I loved, and never had one problem with bubbles or anything else. It should work out just fine. My system used an in sump return pump that was on a box made of eggcrate to get the pump above the sand and rock. Worked for around 12 years and kicked but.
There's nothing at all wrong with using an air driven skimmer. Copepods and especially mysis shrimp would even swim in and out of it to feed on the inner walls of it and not get harmed. They're the friendliest type of skimmer you can have to tiny fragile invertebrate life.