What are these worm-looking things?

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Any thoughts what these tiny white worm-looking things are? I came back from vacation and they’re all over my sump walls… They’re a few millimeters in length up to maybe .75 cm.1
 
Avast
fan worms, very common in sumps
 
These are feather dusters/fan worms, more specifically serpulid tube worms since they use calcium carbonate to construct a tube. They are harmless/beneficial filter feeders.
 
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