Help ID these creatures?

[JasonV]

Hi,
My tank is about 7 weeks old now. I bought these two coral and about a week later I noticed multiple white things attached to them. The green one (I'm still learning names) seems to not be opening up much anymore. Should I be worried? Any ideas on what they are or any solutions please?

https://imgur.com/a/9o9NELn

 

[James M]

spirorbid worms.....harmless filter feeders

 

[JasonV]

spirorbid worms.....harmless filter feeders

Thank you! I looked at the thread that had a bunch of photos but I couldn't tell for sure.