[coral reefer]

Live rock comes in many shapes and sizes! It also contains a myriad of diverse flora and fauna that lives within and on your live rock. Some of these polychaete worms etc. are boring organisms which are evident in the holes(porous) nature of your rock! Your rock and aragonite sand will slowly break down due to the bacteria and organisms as well as the chemical makeup of the water and rock/sand, which is why people add sand periodically to their tank every couple of years or so. The buffering capabilities as well further inpact and speed up the process. This is a good thing however and should not be thought of as a problem with your tank water parameters or bad living organisms found in your sand rock areas of your tank, nor should it be associated with a population explosion of detrimental effects. The only thing to watch out for is the increase of fire/bristle/flat worms and the such which could pose a problem and many times avoidable by cutting down on feeding!