What are these Octo Worms?

[Irsug1]

Hi guys, I just caught these in my JBJ 28. What are they and are they bad? They look like worms with brittle star tentacles. Brittle Squid?
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[Top Water]

They are detritus feeder I believe and they stay put and appear harmless to me

 

[mishmaster]

Spaghetti worms, check reef hitchhikers id on chucks addiction website

 

[Monty06]

Spaghetti worms, and they are good

 

[Irsug1]

Thanks everyone!