I know this has probably been asked a zillion times now.... I just set up my new XP3 last night on my 55g. There seems to be a lot of air bubbles in the filter under the intake, and they cause a bit of impeller noise as well as gurgling-water noise. Granted, I can't hear it over the noise of the SW
tank's skimmer unless I put my head in the stand of the 55, but I thought these things were supposed to be essentially silent....any tricks to get rid of that air? I did try rocking the filter around to bleed out some of the air and that helped a little. Otherwise it seems to run fine and the rainbows are loving the current.