Please help: Alveopora bubbles - disease?

[zmitty]

Hi there,

I've just got back from vacation and noticed some strange bubbles on my alveopora. I have two alveopora frags next to each other. I'm not sure if the tissue was retracted before, so I'm afraid these might be some kind of disease. Can you please provide some help? Should I put it out? Dip it?

Thank you in advance!

 

[tbrown]

That's bubble algae growing on the skeleton where the Alveopora died.

 

[zmitty]

Thanks! Interesting, I've never had bubble algae in the tank and there's no other place where it can be found. I'll try to remove it mechanically.