What is this? ID

[Hornet]

Hi all,

This rock has been in my aquarium for about half a year now. And suddenly this appeared. No clue what it is.
I feel pretty dumb for probably having missed something obvious and so far Ive been able to figure out what most of the things in my tank are (the hitchhikers). But here I have no clue. Any help is appreciated!

 

[Crabs McJones]

Almost looks like a little piece of Wine Glass Algae (Acetabularia)
Can you get a clearer pic possibly?

 

[Hornet]

Almost looks like a little piece of Wine Glass Algae (Acetabularia)
Can you get a clearer pic possibly?

Sadly it's really tiny so no. But I looked it up and it looks exactly like it so I think you're right! Looks like it's ok to keep in the tank? I haven't seen it anywhere before.

 

[Hornet]

Almost looks like a little piece of Wine Glass Algae (Acetabularia)
Can you get a clearer pic possibly?

Oh I see I forgot something forgot.

thank you very much!