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it comes down to trial and error due to differences in how your rockwork is set up. That said, I generally try to get a smooth circular flow through a tank. One way to accomplish this is to set up both returns at the top left of the tank, pointing across the surface. Both intakes are low on the left. What happens is the water flows across the tank, down the far wall and back across the bottom towards the intakes. With a lot of rock, it may be helpful to have the smaller return low on the right side, pointing across the bottom to overcome the rocks blocking things.
 
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