| Mike is right
I like your overall concept and the idea of creating countercurrents, but the returns being located where they are will probably create a "dead zone" at the viewing window. You might be able to move the skimmer returns to flank the viewing window and the mids toward each end to promote the water flow you seek.
As to filtration, what you propose sounds pretty small for such a pond. Off the shelf units are notoriously overrated as to capacity, which helps to explain why so many first-time ponders wind up adding more filtration within 6 months. I would lean toward vortex/settlement type feeding either BS or TT, but that is just a matter of my preference.
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Larry Iles
Oklahoma
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