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I had a 620 in my 16g nano. The flow was too weak in a 16! I upped that one to an 820, much better (in the 16).
I would still use a minimum of two 1100's in your 70. Of course it's up to you. You have to keep in mind that the SEIO's have a very wide spread flow pattern. They are nothing like a MJ, which is like a fire hose.
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