Help! Toadstool with a hole

[JRdgz]

Hi this morning i woke up to see that my toadstool has a hole in the head. He was complete yesterday, and opening big like always. I just have two clowns, watchman gobby, snails and several red/blue leg hermit, same setup for over 6 month now. All other corals doing fine. What can this be? Thanks

 

[dbraun15]

Looks to be dropping a baby and fragging itself...it doesn't look to be decaying in any way, which is a good sign.

 

[vetteguy53081]

Not unusual. Generally due to shedding or presence of a worm whereas shedding is the most likely