Possible eunicid worm?

[vespertineblue]

Got this in my 7 gallon oddity tank, thinking eunicid worm? Can anyone ID this? Must have come in with live rock earlier this year, also have a mantis shrimp in there that I really would like not to be harmed. Any suggestions, keep, get it out?

 

[fishywishy]

Do you have any other fish and inverts in there?

 

[vespertineblue]

Do you have any other fish and inverts in there?

I do have a few snails and a mantis shrimp, brittle stars and pods.

 

[vespertineblue]

Better video