Birdsnest Pest ID

[randoma]

So I've been having a problem with something eating my birdsnest...

Sorry the pictures aren't that good. Anyone know what they are? So far they're only eating birdsnest(!) Although I found some recession on a monti, I didn't find any creatures on it. But I lost a fairly large colony of birdsnest and this one is super infested.

https://photos.app.goo.gl/UDvVQgvcaCKchM7i9
https://photos.app.goo.gl/PBg6FQ2uckvT4j1g9
https://photos.app.goo.gl/1tKsTr9Cq7NS1hXm6

Whatever they are, they're super sticky - I can't blow them off although they come off with tweezers.

 

[ambientaquatics.adam]

Do they move? Kind of look like pineapple sponges but idk if the would grow on living corals.

 

[DSC reef]

Looks like sponge growing on the dead part of the coral

 

[randoma]

Do they move? Kind of look like pineapple sponges but idk if the would grow on living corals.

Pretty sure they're not sponges - they do move. So far I'm only finding them on birdsnest, stylophora and some on a seratosa. None on any LPS or Acro/Monti, although the monti that's right next to the birdsnest has had some recession over the last couple days.

 

[randoma]

The recession on this monti happened over roughly 3 days.

https://photos.app.goo.gl/cujVp8UEDG1E7CKZ8

I did not find any creatures on the monti though. It was right next to the heavily infested birdsnest.

 

[Lovemyreef2015]

I agree with others. Looks like sponge growing on the dead parts of the coral. I also see some vermetid snails on it as well.