What is this

[Wisejw]

I found this today. No idea what it is. Any thoughts. I’m new here and it allows a photo. But I have videos. It moves and then releases and floats away

 

[BrianD]

I believe it is a spaghetti worm.

https://www.waikikiaquarium.org/experience/animal-guide/invertebrates/worms/spaghetti-worms/

 

[Wisejw]

Thanks. I’ve seen them in my rocks but today it was on the glass.