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Water flow on a reef depends in part on the location of the reef. In some cases, flow will be dominated by tide. In other cases, it will be determined by predomiating currents in an area ie: flow only in one direction.
Either way, what you are looking for is mass flow that approximates the laminar flow found on a lot of reefs. Look at the Tunze stream pumps. They move a LOT of water using little power and the flow is more widely distributed. I recently added a tunze nanostream 625 (659gph) to my 40 gallon tank. Now ALL of the water in the tank moves at a reasonable velocity. I am getting good single direction flow across some gorgonians I have just added to the tank.
If you really want to have alternating current like that provided by tides, you can use multiple streams pointing in opposite directions on timers to reverse the current.
Fred
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