In my deep sand bed tank I use a Hydor Koralia movement and circulation pump. It's really an underwater fan: http://home.comcast.net/~onefish2fish/fishweb/ Stream fish love it. You can place it and aim it anywhere you like. It comes in three different strengths to match different sizes of tanks, or you can mix and match. Tom -----Original Message----- From: gsas-member-bounces@thekrib.com [mailto:gsas-member-bounces@thekrib.com] On Behalf Of Shango Los Sent: Saturday, August 16, 2008 3:40 PM To: Greater Seattle Aquarium Society member chat Subject: [GSAS-Member] Move the Water Hi All, My 35 Tall Tanks keeps showing signs of low movement water/stagnancy near the bottom. Right now the return of the water is by spraybar at the surface of the tank. I suspect that the spray bar movement at the top is leaving the lower regions of the tank kinda stale. What does one do to change that? I bet there is some sort of piece of gear to buy or something. Please advise. Thanks Shango _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member