If it is concentrated in certain spots then siphoning out those spots would be helpful. Replenish that water with new. If its just all over, then blowing it and getting it into the water column with your pumps on high will let the filter socks do their job. Do this a couple of times in 8 hours, then change out the socks when the water clears. Some will settle again so repeating the process will get more and more. Doing a water change will help as long as the stuff is in the water column, but will use up salt. Its all manual labor.