Grey worm ID?

[Chrysus]

Wondering if anyone can ID this worm for me? I found a couple of them when I pulled all of the rocks out of my tank. I think they’re living in the sand because I didn’t get any in the bucket when I coral dipped the rocks. I think they’re absolutely disgusting but an actual ID might be nice.

 

[WheatToast]

Here's my shot in the dark:

Ribbon worm (Nemertea)? These are predatory worms and are not reef safe.

 

[Chrysus]

Here's my shot in the dark:

That looks about right! (Although I’m assuming their not the 12-25ft long version that comes up when you google them )
I’m glad I decided not to reuse the sand and hopefully I never see them again. Gross!