The first one is the drain from the left rear corner overflow. I couldn't come down too much farther because of the cross brace. This pipe (w/ the ball valve) continues on to the next pic. I needed the two 90's to drop down under another cross brace. The third and fourth pic are pretty much the same thing just on the right side of the tank.
I didn't get pics of it, but (you can kind of see it in the fourth pic) the right side tee's off to another ball valve where I can adjust the flow to my fuge area. The rest of that pipe leads to the left half of a 75 gallon sump/fuge. (The fuge is the right side of the 75.) The last pic shows how the water flows from the left half of the 75 to a 55 gallon which is used as a true sump. My return pump is in the 55.
I know it seems confusing. Should I scrap the whole thing and go with a more efficient design. Or, do I really just need another drain?