my tank is continally getting quieter, like jon said it would. i'm using 2" pvc, and i have five 90 degree elbows, two above water, three below. i could replace them all with flexible tubing, and i may do so in the future. the canopy also helped to quiet things down. part of my problem is the fact that i have a 30" high tank, so the water is falling 3" into the overflow, then at least another five feet through the stockman into the sump. lots of water flow. be glad your tank isn't in your bedroom, because mine is, and it's not the most effective sleep aid around... 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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