I got many with my original shipment of LR many years ago. I observed that SOME of them ate SPS corals. It was easy to see them doing it because they need to latch onto the coral and rasp away at it for days at a time. Whenever I saw one doing that, I just removed it with tweezers.
The remaining bristle worms were harmless detrivores. Most everyone has more of these than they probably think.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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