I'm new to this and I am going to set up a sump. I'm going to use a 20 gallon for it. I'm going to have my protein skimmer in the first section. In the 2nd section do I use live rock and sand and baffle it before the return section? and would this be enough filtration for startup? I plan on having fowlr to start and hopefully somewhere down the road have some coral. I realize this has probably been covered somewhere here before, but I can't find it. Any help would be appreciated. (it's a 40 gallon tank)....thanks..John