Sump is almost done. Will add the top after the tank is done. I wanna be sure all the holes in the top are in the right place for the over flows and stuff. Water will flow into the chamber on the back right side, then over into the socks. Then out the bottom into the middle chamber. I left a 2" gap at the top in case the socks get plugged, for the water to flow over into the next chamber. The middle will be full of rock and some of those marine pure blocks. The water will be pumped out to the skimmer and returned to the middle chamber. Then over and thru the spaghetti mat. Then back to the tank. Simple design, no frills.