My skimmer powerhead is actually 6-8 inches below the water. It is connected to the skimmer by a 4" piece of white hose. It was like this when I bought it second hand.

The pump I would like to use for the sump is a PRO 4 pump that is rated at 260-400 GPH. I figure that with the 5 feet of head it should be just about perfect.

I should be able to cut the 10" divider 11" at the crash chamber end and not use a 1" strip I think. Also, could I just use two baffles after the 10" divider? One 1" off the bottom and the second 6"?

Thanks!