I've never once siphoned or removed detritus from the sump. Not in 5 years. It tends to break down to nothing on its own. I can see bare glass down there and I don't use a filter sock. I think once your tank is mature enough, and if you don't have a very deep sandbed, detritus is not quite the evil villain everyone makes it out to be. I have to obnoxiously feed my fish several times a day to even get any NO3 reading to show up, and it's quickly gone.