Pest or new head?

[Psychonaut]

I can’t tell the difference. It looks more clear/white than the heads growing on my Duncan’s. Could it be something else?

 

[Crabs McJones]

It resembles a pineapple sponge

 

[ChiSox Rabbitfish]

+1 on the sponge
Hammer split like anemones when growing new heads

 

[Psychonaut]

Ok, I saw a couple little puff balls on a trocchus snail I thought might have been pineapple sponge too, so that would make sense. Thank you