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It depends on what your keeping. I have a FLR and LPS coral. I have a flow around 40 x volume. SPS will need more. I run 3 tunze(6055 and 2 6045) I have found pointing two powerheads at each end of the tank will create good gas exchange and flow. I like the nano's because of their size and ability to adjust. The magnetts are a real plus with these.
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