My DC12000 is really quiet as well. Way more quiet then when I had a Mag 18, and even at level 6 there is very little noise. I agree, if the unit is within warranty period, I would get it looked at.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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