LOL, this was probably my first question when I find online fish forums
I asked the question and was basically told to just live my life. As good of sound carrier as water is (you can hear a boat hundreds of yards away underwater or someone yelling at the other end of the pool clear as day underwater), it's just as good of sound insulator. Have you ever heard someone yelling at you, then you've gone underwater to complete silence? As long as aren't speakers in the tanks or resting on the tank, you're good to go.
Just think of how many tanks across the country are in bars/nightclubs with loud music? While I'm sure there's probably some light irritation to the fish, out in the ocean with the waves crashing on the rocks, it's not exactly silent there either....