Turns out I work this Saturday, looks like it might be one more week till I get the tank [smilie=crying.gif] I think I will be using a 55 gallon as my refugium, and a 75 gallon as my sump. I am honestly not sure at this point though. I could really use some advice on sump layout and design... I would also love opinions on where to put the skimmer, before the refugium, after.... What's the best practice?