Can someone ID this please

[jocoxvt]

Found this on my live rock today really have no idea what it is, any help would be appreciated.
Thanks
jocoxVT

 

[jocoxvt]

To clarify its the black bead type looking thing.
Thanks
jocoxVT

 

[effloresce]

bubble alage, bad thing, dont pop it, it will release spores.

 

[salty cheese]

It’s a rare and valuable green starburst peal, if I were you I would try to sell it on ----.
Effloresce
Are you starting a revolution?