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I would be worried about "stagnant" areas due to lack of flow. I'd rather keep the powerheads in there if everything is working right. I don't see how 5-10x is enough. For a 6ft tank, you'd need more because there is so many places where detris can settle. I just set up my 110g finally, bare bottom and have about 20x turn over rate, still probably have some dead spots though.
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