Can anyone e ID this?

[SPitts6654]

It’s growing on done of my corals and I think it’s starting to irritate them.

 

[DSC reef]

That looks more like sponge or hydroids.

 

[reef lover]

Agreed looks like sponge. Coral is probably irritated with the vermetid snails in the upper left of pic.

 

[El_Guapo13]

Agreed looks like sponge. Coral is probably irritated with the vermetid snails in the upper left of pic.

+1 on vermiteds being the actual irritant