These may not be the prettiest creatures that you'd ever add to your tank, but it is debatable that they can be one of the most beneficial additions to the overall health of your system. They will burrow into the your sand bed to ensure it stays well aerated and promotes the proper growth of denitrifying bacteria. They also have a voracious appetite for any bits of food that fall between the cracks and can not be reached by other members of your clean up crew.

It should also be noted to take care when handling bristleworms as they do have lots of tiny sharp "bristles" sticking out of them, that will poke you.