Just don't leave the sock there though, It isn't necessary to keep it there long term, it is more beneficial to remove it often & clean it. I usually only use the sock to polish off the water when siphoning, I take a long hose & tie one end down into the sock, then with the other end I go in the tank & suck everything into the sock, this is a very good way to remove detritus & not remove your water. They make 1 micron socks which work well for this purpose. The only other time i use a sock is during water changes & while blowing or blasting the rocks with a turkey baster. HTH