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Hi THS, I have a Bak Pak on my nano also. It does a great job but is a bit touchy at times. I also had the micro bubbles at first, they seem to be most problematic when the water is "off" a bit, i.e. salinity, coral sliming , too much food,etc. I have had good results taking a bit of cellular sponge and cutting it into a plug that fits into the outflow tube to kind of "bind" these into larger bubbles. I have also found that opening the air mix valve all the way open(seems backwards I know)gives me no microbubbles unless something in water column is way off. I get dark,wet,skimmate and empty cup every other day. Also keeping the center tube and lid clean in the collection cup greatly improves the skim. The issue of vibration noise gets better if you "pad" where the unit sits on or against the tank with foam tape or similar, also the cup tends to rattle in the box, adjusting carefully makes this go away. Good luck with your reef.
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