Saltylakes:
1) The PC lights will grow corals...but, you may have trouble keeping the colors vibrant. Metal Halides, IMO, are needed to keep the colors vibrant.
2)sorry, no web site......I don't sell frags, I rarely trade frags ( I'm realllllly picky); but, I do give away frags when I need to trim.
3)A refugium could be any size and made of anything. Mine is just a 125 gal tank. The larger the better. It's not directly needed for corals to do well; but, it greatly improves water quality. The refugium is the place to grow lots of caulerpa and regularly harvest it to acheive nutrient export....thus improving water quality.
4)I add no suppliments. I have a calcium reactor for cal/alk additions and use kalk water for evaporation replacement.