Hole in my leather

[Woodchip]

So today a perfectly circular hike apeared on my leather coral. I have a clownfish a mandarin and a Hectors goby so red sage fish. I also have a few hermit crabs but that is it besides other corals. Anyone know why that appeared?

 

[MohrReefs]

So today a perfectly circular hike apeared on my leather coral. I have a clownfish a mandarin and a Hectors goby so red sage fish. I also have a few hermit crabs but that is it besides other corals. Anyone know why that appeared?

Pics?

 

[ying yang]

Maybe reproducing?

Fragging itself

 

[Woodchip]

Here it is

 

[Woodchip]

It just finished shedding

 

[vetteguy53081]

two reasons it will do this:
a- Shedding/reptoduction
B- Presence of a worm which is rare.

I say part of shed/reproduction. Will emit parts of itself then form back into nice shaping

 

[GuppyHJD]

My leather has two white areas at the edges and one round hole in the middle of it. The edges I was thinking something bit it, but the round hole I am not sure. Reading the above messages makes me think a piece tore off to propagate but I do not find the pieces.
Any clues?