I stole this from some other board.
--------------------------------------------------------------------------------
Almost all of us have dealt with excessive noise in our aquariums, one of the major ones is overflow noise - this is how to fix it.
Durso Standpipe
http://www.rl180reef.com/pages/stand...pipe_frame.htm
Stockman Standpipe
http://www.rl180reef.com/pages/stand...n_stockman.htm
Hofer Gurgle Buster
http://mywebpages.comcast.net/domitron2/HGB/HGB.html
My only concern with the two designs is that they seem more likely to plug and that scares me. You would have to isolate your overflow box so absolutly no snails made it in. Great idea though I still think I will use it.
Jon.