Can anyone help me identify the salt water work?

[midwestreef]

I’ve attached two videos of the work, first video is swimming in the tea, second video is after I caught him.

 

[nereefpat]

To me, that looks like nothing. Maybe a string, or a dead piece of chaeto?

 

[midwestreef]

To me, that looks like nothing. Maybe a string, or a dead piece of chaeto?

Thank you for your response, you are the second person that has thought it is fish poop or something similar, I believe it is some sort of worm, maybe dinoflagellate?

 

[DDenny]

Videos won’t play for me