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MP40's all the way. If i understand you correctly, it seems like you are going for a gyre effect but it would probably work better if you tried running it on the horizontal instead of vertical. MP40's low in the tank will create a massive sand storm and even if you run bare bottom, you would have to have your rock work suspended somehow off the bottom to allow the flow under the rock work which is possible, but not sure you get any real benefit from that.
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