I just installed my new Tunze Master DOC Protein Skimmer 9410.000 and there must be something wrong. It is really noisy. I have cut the air down to next to nothing, and that helped, but still, really noisy, and so far, not much bubble action. If I remove the cup, the bubbles disappear, and they won't appear until I turn it off and then back on. I get a pretty strong hum that transfers to the rest of the house. This is the reason I replaced my Octopus skimmer. I'm also getting a lot of water noise from the super strong flow through the stand pipe (the part that holds the filter sock holder). Is this normal? Do I not have enough water in there? Too much? I'm running around 7 inches of water in my sump. I'd really appreciate any suggestions on getting this quiet. I'm running 7 Tunze pumps/powerheads in my tank, and this is the only really noisy one. Thanks for suggestions!