Worm/ eel thing?

Dickeybrazil

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Anybody know what these are? about an inch long. Sorry for the dirty glass.

worm 2.JPEG
 
This new tank/rocks? Looks like a lancelet to me. Harmless and invariably die out.

Edit: video didn't work for me, so couldn't see swim pattern. Lancelets are pretty frantic swimmers when disturbed.
 
It is a lancelet which is a segmented worm that prefers substrate with shells and is a hitchhiker that scavenges. If they are thriving, you may be overfeeding or lacking in siphoning and maintenance.
 

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