Pest?

[CoriReef]

Hi all! I just noticed this huge black glob on my zoas. Should I try to take it off? It looks slimy not like cyno and the zoas look fine.

 

[saltyfilmfolks]

Kinda firm. Scrapes off with a finger nail?
Probably black sponge. Yea scrape it off.

 

[CoriReef]

Ok. Thanks I thought it might be a snail or something but I don't think it has moved. Thanks again!

 

[saltyfilmfolks]

Yep.