Small update- alot of my sps is now gone, and I have moved about 1/4 of my rock to the sump. I also have about 85-90 pounds of new dry sand ready to put in. My 30x14" sump is now about 1/3 full of rock for my cryptic fuge and I plan to add more. I'm going with mainly natural filtration on this setup..only rock, sand and my skimmer. My goal is to have tons of sponge and feather dusters in my cryptic fuge.