Strange worm?

Hey when should you be concerned about bristle worms? I mean I have one live rock wit five sticking out trying to catch flakes
 
I have just seen one about six inches and it was thick so I took the entire rock out and put it in a bucket of tank water tell me how long would it take to starve the worms out or even if it's possible
 
I probably already know the answer to this but how do people find these different species in their tanks without knowing that they're there. Did they hitchhike from your LR? I would love to find a nice bristle worm in mine but my LR came with nothing but empty clam shells...hahaha.
 
I have just seen one about six inches and it was thick so I took the entire rock out and put it in a bucket of tank water tell me how long would it take to starve the worms out or even if it's possible

Why do you want to kill them? They are a good member of the cuc...they will prlly just find food to est off the live rock for a while.
 
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