I wouldn't set my tank up the same way as Tangboy did. In my original post, I said it was an "...excellent example of how someone can take a system that was really designed for FW..." It's not perfect, but it's come a very long way from where it was in the original photo.
I would have used a filter sock for mechanical filtration. This keep a lot of particulate matter out of the skimmer. I also would not has used a Prizm slimmer, because they are not especially effective. I would have also arranged the baffles differently, but that's a minor point.
I happen to be using a berlin type sump. Here is a link to a manufactured berlin sump.
Berlin Sump Aquarium/Water Filtration System
I'm not recommending that anyone buy the product. It's an example only.
Note how there is almost nothing in the sump, except a filter sock, and a sponge, which in this case acts as a bubble trap. I don't use a sponge in my system. As a not, some people claim that the sponge is a low oxygen area that can do denitrifaction. I don't subscribe to that because the sponge is far too small to really support enough bacteria for that process.
Berlin sumps are used with large powerful skimmers, for the size of the tank. This is done because the skimmer will remove most of the waist products before the rest of the filtration system needs to deal with them.
I have explained to you, in other posts, the reasons for not using bioballs and live rock in a sump. This was when you asked about specific questions about an algae problem you were having. Now if you don't want to listen to me, that's fine. However, I suggest you post your original post on one or two other reef forums, and see how many people tell you to "loose the bioballs."