Are you messing with us or what man... microorganisms are on just about every surface in this world. If you have live rock it is covered with the bacteria that cycles the tank. If you cant understand that rock from the ocean has life on it that you cant see then keeping a saltwater tank is going to be way to complicated for you. yes, most of the time live rock will have bristle worms, feather dusters, pods
, etc... but that is not a guarantee. Hope you’ve got it cause I can take the pain of answering no more.