Worm Shaped Critter - What is it?

RYcube2951

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Found these worm type critters in my substrate during water change. The body is long and slender with a dark colored stripe on it’s back. Has anyone had these and can identify what they are and if harmful to corals, fish or inverts? Thanks.

823A33F2-3B61-4C9C-B6AE-7B973E22DB86.jpeg
 
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ying yang

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Looks like baby bristle worms and most class them as beneficial cuc members,I've found a few small ones like yours in my tank .
Aslong as they stay small I don't mind them,but if they get big beasts like 6 inch plus then I don't like them and don't want in my tank ha ha
 
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