Bubble on hammer?

[Adam113]

I noticed tonight that there's a bubble in the middle of my hammer coral. I've read that this usually happens before they split? Is this true?

 

[saltyfilmfolks]

As of this article. We apperantly don't know why they do this.

 

[Adam113]

Noticed this morning when the hammer was retracted that two of the original three heads are branching. :)