Okay...I'm new to this forum thing. I've been out of the hobby for about 4 years. Prior to that I had a successful 85g reef aquarium. I had set it up according to Tullock's book Natural Reef Aquariums. Now I would like to start again, but it seems like a lot has occurred in that 5 years. Refugiums?, closed loop systems? I need some advice on diagramming the plumbing and electrical plan. In particular I would like to have a refugium (size?), and I think I'm going to go with an Aqua C EV-180 skimmer. Should it be external, or in the sump? Should it be near the external return pump? Thinking Little Giant here...unless someone has better advice for the return pump. Help!