ID on a worm?

[Magickiwi]

If it is a spaghetti worm it won't harm anything in your tank directly but they do have a tendency to irritate polyp'd corals to the point where they won't open. I've read that sand-sifting stars will make a lunch of them.

[EquiReef]

Am I best to remove it then?

[pinkreef]

I vote its good

[saltyair]

i have never seen or hear of a spaghetti worm being harmful - they are a useful part of your cuc. Keep him you probably have many of them in your rocks.