I just got a Red Sea Reefer 525XL. I have never done a sump before so I am confused. I have the Red Sea Skimmer and pump. I plan on using the sump that came with the setup. Where does the skimmer go? The pump? Down the road I’d like to add a refugium…. Where does that go? Where do the bio balls or live rock go? And there’s a top off reservoir???? I don’t think the directions are helpful at all. If any one has pictures and/or a diagram that would be helpful. I’m so lost right now.