Thread like worm?

I noticed what at first looked like a white thread had landed on top of one of my live rocks. Afrer looking at it awhile, I noticed the end was moving as in a live entity. Anyone have an idea what this "worm" may be?

 

Maybe a spaghetti worm. Can you get a pick.

 

It will be awhile....is this not a good thing or???

 

There are sooooo many types of marine worms and different stages of their development.

The vast majority that are common in this hobby are harmless. I would not worry about it, you are going to see a lot of different types. Unless you witness some type of unexplained damage to corals I would not give it a second thought.

But if you are looking for worm ID's here you go. This link will serve you well in future ID's.

Live Rock Hitch Hikers

 

Outstanding link...thanks very much!

 

Could also be a digitate hydroid.