Water motion in tank.

[Troy F]

Well, I picked up AFM's new issue and low and behold, an article on water movement by Ron Shimek. I see Darren already bought it. Too bad Ron doesn't really have any advice on how to improve water movement but only to select animals that don't live solely on a reefcrest.

Any of you physic majors feel like describing what Ron means by 1000mph water due to tidal action? I should re-read the article and post my question better but I don't have the time right now.