There are numerouis ways to set up a successful reef system. There is not one way that anyone can possibly say is the "correct" way. That being said, I don't want to hijack this thread with my own system but the topic is help with a new sump so here are a few pics of the sump I just recently created. It's actually 2 - 29 gal tanks connected together.
SUMP 1: Water enters this sump from the main display.
My Deltec isn't hooked up to the skimmer outlet yet as it is sitting on another frag tank at the moment and can't be moved yet so I just dropped one of my ASM's in this sump temporarily. When completed, this sump will contain filter feeding organisms such as tube worms, bivalves and sea cucumbers.
SUMP 2: Water overflows from sump 1 into this sump.
This sump is covered so that it blocks light out and will be a cryptic zone which will contain cryptic sponges, bivalves and sea squirts.
These baffles are set a bit differently than I would do for a regular sump because I don't want high flow through the cyptic area. As it is set up now the majority of the flow will simply ride across the surface and over to the pump return area.
Overall concept is the zonal method of natural filtration. IF these two sumps take off and generate lots of organisms for me then eventually this new system may go skimmerless. We'll see.