ridetheducati
20 and Over Club
I am going to guess without research that the feather dusters I have by the dozens live on plankton?
And detritus.
As others have mentioned above, I stopped using sponges and socks years ago. The sump is a filter and will gather the detritus and it needs to be vacuumed at least bi-weekly. A top notch skimmer helps as well, arguably the most important piece of equipment in the system.