I don't have enough room in my stand for a sump so I'm guessing that a HOB refugium is the way to go. I see some of them have a skimmer included and I like this idea. When I started my tank, I made the typical newbie purchase and got a Sea Clone. I don't like it and have read many bad reviews about this unit. Can I use a refugium with skimmer unit as the only source of filtration? Anyone have experience with these?