what is it?

[Aqua Erik]

I bought some live rock and found these small white colored objects are they a type of sponges or what? thanks.

 

[BlennyBabe]

I have tons of those. I believe they are calcerous sponges. totaly harmless.

 

[Alice]

Yes.

 

[Aqua Erik]

so are they alive since they have been out of water and will they spread? Thanks!