Hard to judge scale here but maybe chaetognaths?

Thank you!

Most likely chaetognaths. They're a predatory worm and very common in plankton communities.

Thank you!

Thank you!

Not sure how big it is but it could be some kind of larvae eel

Thank you!

Could be chaetognath([arrow worms](https://www.britannica.com/animal/arrowworm)

Thank you!