You may need to move it around to fine the sweet spot though. Typically people say 2 pumps so that you can avoid dead spots caused by 1
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I think you'll be pleased with the flow from an rw4. I have one blowing the length of a 40g breeder at 3/4 power.
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No dead spots, but it's a fairly open and unobstructed frag tank. Bang for the buck I don't think you can get better flow and more options than with the jebao. You may always need multiple pumps no matter what brand you go with to eliminate dead spots. Just a thought, have you considered a gyre?
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Keep me posted. I have had a few different sized koralia's and now I run all Jebao's and am quite happy with them
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