i dont want to get too off-topic here, but other than being big into audio, im a big "fishtank nerd" as well.
first off, beautiful looking tank youve got there! i recently set up a planted tank of my own. but out of curiosity, do the sound levels bother you? i have a Rena XP-3 on my tank and a few powerheads in the display so i dont have churning water for a noise factor. but cooling fans are another story ;-)
im curious as to how you handle the noise (or if you even address the noise issue), and seeing as you seem to have a canister filter as well (judging by the pic) how you can keep your noise down but also efficiently break up surface tension in your system