Hi Bob, I'm willing to bet there's a few of us that have tanks in the bedroom! My wife wouldn't tolerate it if it wasn't completely silent! The two things I have done are 1) a very small air pump with a sponge filter, which still has bubble noise even though very slight, and 2) the absolute quietest has been a very small power head on the lift tube of an undergravel filter. If everything is kept below the surface of the water, there is no noise at all. My 2 cents :) Phil _______________________________________________________________ Get Free Email and Do More On The Web. Visit http://www.msn.com ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!