Ok, first of all I want to apologize if this subject has been beaten to death. I need some clarification here. I know there's a million ways to do everything, and every different way has pros and cons, but I can't come up with a good answer about sump/refugium design. I've heard one argument that high flow (10x-20x sump volume) is necessary to bring nutrients to the macroalgae and get better export, but then the refugium isn't exactly ideal for copepod, etc... propagation with that high flow. Then there's the opposite theory that it should be very low flow, which is supposedly ideal for the copepods, etc... but not for the macro. Also, I've heard conflicting info about feeding the skimmer with raw tank water or feeding the refuge with it. What gives? Are there pros/cons for going one way or the other, or even both? It makes sense to slow down the flow through the sump, for noise and filtration reasons. Would it be the best of both worlds to have 2 seperate fuges: 1 for macro with high flow, and 1 with rock rubble/pile and low flow for copepods, etc...? Or is it not worth the trouble if the main tank has plenty of LR? I don't even want to go into the DSB theory in the refugium...Again, sorry for the long post. I'm sure I'm kicking a dead horse, but any help would be appreciated.