At 1680 time your sand is pretty much a quarry, lol. If like me and you don't syphon it every week you should find lots of life in it. Specially small snails growing between the rocks and devouring detritus and taking care of business for ya. Lots of worms the Cirratulid worm is a very good worm to have detritus eaters , but needs a stable sand to populate. Lots of pods and littles critters between the massive grain of sand.