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					Originally Posted by  nlreefguy
					 
				 
				yep, rock in the middle, maybe in a couple of "towers" with swimming space between.  I want a lean layout this time instead of the "wall of rock" i have usually had. 
			
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 Then put your flow generator (vortech, tunze, closed loop w/eductor - doesn't really matter which one) in the hidden end off to one side and you'll have a Gyre.  It works the same way as a whirlpool that builds up centrifugal force as it spins round and round.  It works best with an up/down pulse.  If you want really fancy then simply put a flow source alternating on each side for reversing Gyres.