Black stuff on Caulastrea

[Hölpötti]

Can anybody tell me what is this black stuff on the body of my Caulastrea?

 

[Retro Reefer]

Kinda hard to tell from pictures but most likely a sponge

 

[Coastie Reefer]

Agree, sponge.

 

[Hölpötti]

So nothing to worry?

 

[Coastie Reefer]

So nothing to worry?

Not really... you could scrape it off if you think it's unsightly.

 

[Wide Eyed Coral]

Sponges often grow at the bases of LPS