Reefkeeper you said something that grabbed my attention "" it seems to not have enough power for the diamater" I have had the same problem with my ER CS8/2 it could only make some bubbles but no skimmate it seemed to not have enough power to make skimmate. So I thought it was a weak pump so I borrowed a brand new Sedra 5000 it worked a little better. So my conclusion after 6 months of frustration is that the skimmer is oversized. I put my old CS 5/3 and it pulls a cup a day. It is a 120 reef with 100ppm nitrates. So I hope this helps,
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