what to remove from live rock?

[dekay]

Just finished reading an article on www.liveaquaria.com regarding how to clean/cure live rock. One part mentioned putting all the live rock in salt water with a gravity of 1.035-1.040 for a minute to take out unwanted pests like bristle worms, mantis shrimps and crabs. I just want to make sure that these are really things I want to take out. Furthermore, what should I put back in?

If you could also provide pics or links of pics of bristle worms, that'll be great. I have no idea what they are.