Unsure if this is a hitchhiker or ??!

[AmandaMarie1116]

Started doing my water change and noticed quite. Few of these guys? I am wondering if it’s a hitchhiker or baby coral? It’s very interesting how fast it opens and closes up.

 

[vetteguy53081]

Can’t see video. Any still pics under white lighting?

 

[Rmckoy]

Can not view the video .
pictures or upload a video to YouTube and post a link .

 

[PR_nano]

Hydroid, filter feeders but can irritate corals. See if you can remove while there are a few. They propagate rather quickly