I have a 46G bowfront tank drilled near the top center for overflow to a sump. I have a koralia 3 (or 4 - don't remember which) in the dt. It seems to me that the overflow only takes care of particles in the top couple of inches of water, but I have fine particles floating around and being blown around by the kor. One of the reasons for drilling the dt was to relocate equipment to the sump so the tank would look less cluttered, so I don't want to put a filter back in the dt. Any ideas how to get the water clear?