Any Clue?

[nukinfuts72]

Pulled a frag plug I had out of one of my rock and noticed all of this on it. Any clue to what it is. Its hard and will break.

 

[SAPPER]

Looks like worm tubes

 

[Neo Jeo]

EEEEEEEEEEEEeeeeeeeeeeewwwwwwwwwwwwwwwwwwwwwwwww

 

[savetheocean]

Are they alive?

 

[reef lover]

Tube worms and yes I see heads in there so alive..

 

[Mikedawg]

Vermited snails:
Seal them with glue or break them off; some reefers believe that they can irritate corals.

 

[reef lover]

I don' believe they'e verms

 

[fyler83]

Don't look like vermited to me

 

[jimo12]

what the heck never seen this before defnetly not vermitid snails i know i have about a million