Aquariums and home theater systems

I just recently purchased a home theater system. Its located in the same
room as my 50 gallon aquarium.

I don't listen with the volume so loud that the windows rattle or anything,
but still, the subwoofer definitely pumps out that base and makes the floor
rumble pretty good in some movies.

Do I need to be concerned about any effects this may be producing inside
the aquarium? Among other fish, I have one silver dollar who just
celebrated his 20th birthday. I'd like him, and his younger tank buddies,
to continue to live a happy life. I've had this hooked up for about a week
now, and I don't see anyone going in to massive hysteria or anything, but
I'd like to ask and be sure :-)


David