The tank always has particles in the water and in the return section of the sump a slow build up of yellow-brownish matter which if I disturb clouds the water, I siphon this out before w/c's. 1 to 2 inch lengths of yellow-brownish stringy poo come from holes in the rocks and the flow from the returns breaks it up into dusty particles which find their way to the sump and circulate in the dt, some morning there will be a pile of this on the sand next to the rock. I know there are spaghetti worms in the live rock-tentacles all over the tank day and night. No fish yet. Has anyone else experienced this please? Carribean live rock (60 pounds) Thank you.