I run a Sequence Barracuda on a closed loop on my 180, the Dart would probably be enough flow for you.
I run a manifold, I have 1" PVC all around my tank, then I have 7 t's that go down to 1/2" threaded, and have 1/2" locline coming off the t's. This is not random flow other than pointing some of the outlets towards eachother, but it is very adjustable to whatever I want. When I feed and can see the currents this setup makes, it is amazing. Ocean motions 4way would be even better of course, but pricey.
So you will need 1, 1.5" intake for the closed loop pump, then however many holes you want for returning the water.
For the drain holes, I would use the closed loop for the majority of circulation (or 2 large powerheds - Seio/Tunze streams) then the sump return would be fairly weak, say a mag 7 or 9. I would still drill 2 x 1.5" drains and put durso standpipes in them, this way 1 drain can fail/clog, and the other will still operate for you. The return line size, 1" is good enough if you use a weaker pump as I suggested.
Have you made sure you can drill the bottom glass for your center overflow?
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