What you can do I had the same problem with my deltec 702 and what I did was get 2 John guess fittings and take depending on how many pumps you have for the skimmer and use RO line and attach it to the air line and take the John guess fittings and insert them into the air holes on your collection cup lid and then hook up the line to that this will quiet the slimmer down 90 % I promise ya look at this pic
Hth
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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