WHAT IS THIS THING?!?!?!

thatguysulli

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Before i took it out of the sandbed, it was long and stringy spreading over the rocks. I'm sure it's a parrisite but is it harmful to my coral?

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ISpeakForTheSeas

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I always struggle to tell which from pics, but, either way, it's harmless:
Looks like either a hair worm (Cirratulidae) or a spaghetti worm (Terebellide) to me - if the tentacles all come out from a single point, it’s a spaghetti worm; if they come out from basically all over the body it’s a hair worm.
 

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