Thanks saltlife, I'll check your video out. Actually, you want to keep the feather dusters. I have them in my tank and in my sump and I've been told that they are good to have and are a good sign of good water quality. They are beneficial because they are filter feeders and pull stuff out of the water. I believe the are used a lot in benthic zone filtration, a more natural way of filtration. I don't know much about it but when I get some time to do the research I want to learn more about it. For now, I'd leave them there and only clean them off if they start to interfere with your equipment.