On a quick look, it appears the NAC3.5 doesn't have a silencer on the air intake which means the intake is probably audible. Maybe you can order one and add it? I'm not sure. I'm not familiar with the pumps either, so someone else would have to comment on noise there.
I don't have first-hand experience with these skimmers although they look good on paper. They are a proven design that is very popular among many skimmer manufacturers.
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~ Mindy
SPS fanatic.
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