Welcome to maast. Tell your friends about us. Your picture/drawing shows 2 drains that come into one. I would make 2 drains. Have one drain into first section you could use that section to put a Skimmer. The second drain put it in the middle section and use second section for a fuge. Or have 1 drain on the left for Skimmer and 1 drain on right for fuge and have the middle for your return pump.