Bristle worm? Or something worse?

It's still fine. The fire worm you have to "worry" about is the H. carunculata, as they eat coral. None of these are an H. carunculata.
 
The way I understand it, as long as they are smaller, they are good. That one was almost 8 inches and was knocking stuff over and I am almost certain it ate my Coris Wrasse.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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