I have an oceanic 150 gallon tank as my sump in the basement. It is seperated by baffles into three sections. First section is where the water enters from upstairs, and that section also has my protein skimmer. Then water flows into the fuge which is about half of the tank. water then flows through baffles to the return section where i have my reactors, ATO system and heaters. Water then flows into the return pump and is split into two lines. one goes back to the display and the other pushes water into my frag tank, which then drains back into the fuge. I am out of the country for a few weeks, but I will try to get you a picture when I get home. Hope this helps a little.