Yup, a manifold indeed! I'm hoping to build one for my next tank.

No metal, that's right :)

OK then, I need to change the title LOL

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A very nice looking manifold at that. My concern with it is that you might not get the flow you want with a Mag 12 at that head pressure. Did you say that you were thinking of a mag 18? I think it would work better.

Ahh, ok. Was thinking an 18 would have been to much?

It's somewhat surprising what some elbows can do, to drop your flow. Check the calculator out to get an idea with your layout and different pumps.

http://reefcentral.com/calc/hlc2.php

I was just thinking, would the Mag 18 be too much flow for a 15G sump tank? Was thinking rubble and sand, skimmer at a later date in the sump. 15g is the largest I can fit, and be able to remove it

If you're planning sand in the sump, thats a lot of water moving for it.

Why do you need to remove the sump? What's wrong with craming the biggest sump in the stand that will fit then slide the whole thing against the wall?

Cause it's a corner unit tank and stand. The largest that will fit is 12x21 Unless I build a triangle one LOL.

What flow should I be aiming for in my sump? Looked ay the overflow again, not enough room for a pump in there, so it's the sump return only. I guess I could have the tank drain split into 2, one near the pump, and the other for the flow across the sand?