Drill a siphon break in your return lines?
 

I have dual 1 1/2" return lines that empty down to my sump when the power kicks off, Could i drill a hole in the side of the elbows so the water that would blow out of it would stay in my overflows and would it work to keep the water in the pipes and not drain back to my sump?

not sure what you're meaning, siphon breaks are in the return line so you are not draining back from the display. Whatever water in your return lines between the siphon break and pump will still flow back to the sump.

LOL i was reading that right after i clicked post... didnt make much sense still having first coffee :)
My return bulkheads are below the level for my overflow so my display will drain about 2" to the bottom of those bulkheads... this is what im trying to avoid as its like 80 gallons or so.
http://img.photobucket.com/albums/v6...1ca/001-17.jpg
So if i were to drill a hole at the top of the elbow behing that bulkhead it would stop at the top of the bulkhead?

yours is like mine, they don't go "up and over" so there's no siphon when the pump is off, just a free flow line, so a siphon break hole won't help. Can you redo your return line within the overflow something like:
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| |___
|
|

I would said no. The water would still flow by gravity to the sump until the water level gets to bottom of return bulkhead

I would make an output piece with a couple of 30 deg fittings to bring the out put higher, then you also have the ability to adjust the flow. I had to do this to my 110g as the output was up through the overflow also. Stupid design IMO.

http://i589.photobucket.com/albums/s...0/IMG_4815.jpg

I used Loc-Line & Plastic Modular Piping. To raise the outlet just below the water line
http://www.jlaquatics.com/info/213/L...ar+Piping.html

Just notice that you have 1 1/2" return line, this may not help.

I was thinking this as a first option aswell, i need some kind of 1 1/2" threaded fittings and then try to either make a manifold of 3/4 Lok lines or use 45's as high as the overflows???
but keep it all black abs...

You should not be using ABS in any salt water tank, PVC pipe only.

From my ABS thread just a few posts down....