I had a 90 gallon African Cichlid tank in my room until recently. I used a big Hagen canister filter and it was very very quiet. So quiet, that from my chair I couldn't hear it at all. I think you should go for it, especially if you can put the plumbing in a basement... The fish never seemed to notice the music at all.
Aquariums and Audio Equipment
I'm dying to shift my audio equipment closer to one one side and center a 80 gallon reef aquarium between my revel studios. However, I'm getting nervous about the potential problems this may present (flourescent bulbs, potentially noisy pumps, caustic salt water, bubbling of jets, etc). Anyone have experience with mixing aquariums with audio equipment?