White bulbous growths on live rock

[Albindia]

Have had my tank up and running about two months now, and noticed these white bulbous things growing off my main piece of live rock, anyone know what that are? Are they harmful??

 

[Albindia]

I think I'm going to id my own post - pineapple sponge??

 

[amanda_marie]

I think I'm going to id my own post - pineapple sponge??

Looks correct to me.

 

[okapizebra]

I agree, it looks like a pineapple sponge.