Found this strange worm under the sand, what is it?

[road102]

I have this Worm isolated, not sure if this is a good or bad guy for my tank !!

any ideas?

thanks!!

 

[RedoubtReef]

spaghetti worm, perfectly safe. They're even marketed as "Mama Mia Worms": https://ipsf.com/reefworms.html

 

[GoReefin]

spaghetti worm, perfectly safe. They're even marketed as "Mama Mia Worms": https://ipsf.com/reefworms.html

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