Good worms?

[Mmckmg]

Hello

I was wondering if these worms are an issue or not. I think there's a feather duster worm (or aptasia?) but there's a heap of white harder worms sticking up from the rock too.

 

[James M]

Feather duster...harmless filter feeder

 

[Mmckmg]

Thank you

What are the little white worms?

 

[reef lover]

Google hydroids