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it looks like i will be getting a 120 gal. w/ 40 gal sump and probably going to run the sump a little over half way so like 25 gals extra. so with that making my total volume 145 (150 maybe). and i know you want to turn that volume over 10-15 times. making that 1500-2250 gph.
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I agree with what Dave is saying about "turnover" vs "flow". Personally, I would suggest going with a lower turnover through your
sump (3-5X is sufficient). And I would get the rest of the flow within the display. Your idea of a closed loop manifold is a great way to distribute flow into more areas of the tank, without blasting away from one powerhead output. However, I wouldn't recommend a spray bar...haven't heard too many good things about those.
If you use a closed loop manifold, you can plumb tubing and outlets across the top of your tank as well as down along the back of your tank and towards the bottom. Also, you'll have the advantage of not having all the powerheads IN the display, which some consider an eye-sore.
Here's a link that I think Dave might have been referring to:
Goodbye Powerheads
Good luck!
