I am setting up a 40 gallon (36L X 15W X 16H)propogation tank. I plan on using PC lighting (apporximately 200 watts). Is this amount of lighting sufficient for porpogating SPS or anything else I may desire? What is the best set up for propogation (substrate, filtration, live rock, etc.)? Any advice would be greatly appreciated. Also, I am a novice and am going at this somewhat blind, so please forgive my next question. I have heard frequent talk on this board regarding refugiums...What exactly is this, and what is it its purpose? Please advise.