Eunice worm tube lining?

[rraquaticsSC]

I’m setting up a shop and came in to find this in my new peninsula after transferring a large mature piece of live rock into it. Did not match parameters for a piece of rock so suspect I may have irritated a Eunice worm and the lining of its burrow??

 

[Gumbies R Us]

@ISpeakForTheSeas