Sometimes the meat will sag and eventually break off forming a new coral (can't remember the name of this process). That's actually about it. Mostly they just keep growing larger and forming new mouths. I know they can actually split because I've seen a few that had in the wild but I've never seen it in captivity. I've got an aussie one that had one mouth and was around 1.5" around 3 years ago. It now has 4 mouths and is around 5". Amazing coral and very very hardy.
These are alternatives to actual release of eggs and sperm which I'm pretty sure has not been documented on this species in captivity yet.
