I don't use socks and my sump and tank sand is clean. I believe it is because of the healthy amount of bristle worms and pods. All my rock came from the ocean, Fla gulf'So do most people here run filter socks or not?? If i dont run filter socks the sump gets full of ditritus and i feel it may be a concern but from reading these posts it seems it may not be as bad as i thought.. so ditritus is food? Do people find tanks do better with or without filter socks?