What is this hole all about?

[Algaewarrior]

I just noticed this hole in my coral today. Is it a worm or some kind of pest? I've never seen anything like it.

 

[Hitman]

Following along. Did the lite colored lines show up around the same time you noticed the hole?

 

[Algaewarrior]

The lines are a part of its pattern. Like a war coral.

 

[Algaewarrior]

It almost looks like its closing up now. So weird.

 

[Algaewarrior]

It almost looks like its closing up now. So weird.

Pic

 

[reef lover]

Gall crab or coral barnacal...maybe