Has anyone installed one on their protein skimmer, I just upgraded to one and there are so many micro bubbles, is this normal for this pump the first few days?
New pump and you didnt thoroughly clean it enough, manufacturing oils or whatever still left on the pump so micro bubbles everywhere.
You going in and replacing the pump will ultimately introduce body oils into the tank causing micro bubbles.
The new skimmer pump performance is better than the old one, your skimmer body not designed to handle the increase of bubbles/flow causing micro bubbles.
The first 2 are easy, just need time for the bubbles to settle and should skim normally in a few hours.
The last one is a bit tricky to fix, you probably have to limit the air intake or flow to match what the skimmer body can handle.