I'm running a closed loop with an Ampmaster pump, an OM 4-way and OM Revolution nozzles.

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Your setup is cool, but could be a bit on the pricey side, we'll see. How is the maintainence of the OM 4 way and the OM revolution nozzels?

I run 3 lines off my return (not on purpose but the biulder drilled too many holes) 2 of the return lines are on Wavyseas and the 3rd is just straight. I then have a closed loops system with a Ocean motion 4-way. the 4-way runs; left and right side of the tank open together (2 outputs per side) then top front and bottom rear open together (4 outputs per).

j

400 gallon 6 foot by 4 foot.

Two Dart powered closed loops, each running through OM4ways to outlets on the back and bottom of the tank.

4 outlets on the lower back wall, one outlet close to each corner on the bottom to the tank.

Dart powered sump return also provides pretty good flow through 2 x 1" returns that run over the back wall and deliver water pretty much straight down the back wall.