Well have had the tank set up for just over a year now & I thought there might be something living in there besides the Blue Damsel fish! Have seen a lot of sand digging under the live rock..Today before the lights came on there he was in plain view...We all freeked!!! What the heck is it? Now reading some of the posts found out he is the pink Bristle worm & he is good for the tank as part of the clean up crew...Thanks to all that have posted & replied to wonders of the salt water world!!!! Now any one know what are all those white things on the back of my tank? Thanks...