What is this thing?

[drewwCh]

Hey guys

So today, I jist noticed these things growing under my rock.

They appeared before, but i thoight they were just dead barnacles from coral, but now they're multiplying.

They have this clear tentacle like thing.
Sorry for the bad quality video, will try to get better vids amd pics

 

[Topekoms]

A nem or a hydroid

 

[drewwCh]

A nem or a hydroid

thanks! by the way, do you know of any way of eradicating it?

 

[Topekoms]

Scrape it off suck it out

 

[drewwCh]

Scrape it off suck it out

thanks!!