I am setting up a 75g tank. I have bought a 40 g sump from a friend. I am looking for recommendations on filtration systems. I am thinking of a filter sock on the inlet pipe, followed by protein skimmer in the 1st section. I was going to put the return pump in the middle and a refugium on the far side. I have 70lbs of live rock to put in the tank. Will this allow me to keep some lps and sps corals as well as fish? Should I add a powerfilter somewhere in tne system? What about boiballs and activated charcoal? I am just so confused .........