I regularly blast my tank with a turkey baster, and I would say I usually get more detritus off my live rock than from my sand bed. Detritus
should be consumed by the sand bed inhabitants, there sure seems to be a lot of action there in my tank. A labyrinth of worm tunnels and other little unidentified (at least by me) creatures- definitely one of the more fascinating areas of of my tank.
It's amazing where a little question about nutrient reduction can take us
