Infection?

[Dalmatia]

 

[saltyfilmfolks]

No not an infection.
A common thing we're not sure what it is.
http://www.advancedaquarist.com/2012/10/corals

 

[Travis91]

I think euphillia corals develop that bubble when they are splitting!! So looks to me like you're colony just got a little bigger! Congrats!