Problem with Favia?

[04scoobysti]

I've had this favia for about 10 months, and in the past month and a half it has developed a bubble in it. I'm wondering if anyone else has had this happen to them and what i should do? leave it alone? move it? etc.

I was told by someone on RC that it was just basicly "fraging itself" and i should leave it as it will "split" off and start a new colony.

I'm having a little bit of a hard time believing that, i think it could be overactive zooanthellae producing an oxygen bubble.

Heres a pic: