Can anyone ID please?

[AUSXMD]

I just noticed today this growing out of live rock. It looks like bean sprouts. A couple snails have them on their shell too. Thank you!

 

[KrisReef]

Acetabularium, or something like that.

 

[ISpeakForTheSeas]

Acetabularia - Mermaid's Wineglass algae.

 

[Labridaedicted]

Acetabularia - Mermaid's Wineglass algae.

I'd always heard it called Mermaids Parasol or umbrella. I hate common names, lol

 

[KrisReef]

I'd always heard it called Mermaids Parasol or umbrella. I hate common names, lol

"Neptune's mushrooms"

 

[AUSXMD]

Acetabularia - Mermaid's Wineglass algae.

Harmless or will something eat it? Thanks!

 

[ISpeakForTheSeas]

Harmless or will something eat it? Thanks!

Mostly harmless, but I've heard that tuxedo urchins will eat it.