I have it all set up and it seems to be working. The bubble level is right near where the tube narrows- about an inch below where it would overflow into the collection cup.

First Question: Do I just leave the skimmer running all the time?

Second Question: Do I adjust it every so often to let the bubbles overflow? Or what?

Final Question: What does the protein skimmer actually remove? Ammonia, Nitrates, Nitrates?

Thanks in Advance.

Dave