Blob on Coral

[Buffy]

Hi,

Can anyone please tell me what these 2 greyish blobs are on my coral?

 

[ccCapt]

Looks like sponges.

 

[Buffy]

Looks like sponges.

I have a different picture now. One went away and looks like a shell in its place and the other has gotten smaller.

I have this in my thread too, I forgot I posted here. Sorry