Plumbing is always interesting, one thing I've seen posted on RC about durso style, is they quiet down over time once you get a 'slime coat' on the inside of your pipes. My nanocube is running a 1" herbie and is almost dead quiet. It makes splashing noise entering the overflow box though, hopefully going to fix that tonight 
Not sure if you saw this link I posted in some other threads, but it's a very neat concept I'm going to put on my 75g;
http://www.beananimal.com/projects/s...ow-system.aspx
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28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable
Established March 2006
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