plumbing pump

[paramediclane]

i would like some ideas on the best way to use a mag 18 on a 90 gal aga reefready. the pump will be used external and will run my skimmer too. i dont want the pump to fill up the overflow and flood the place. maybe a vertical spraybar in both back corners? should i use both holes in the overflow for drainage, and return over the back of the tank. please give me some information before i plumb this big boy up.