is it dieing?

[Cottonmdalton]

I did a coral dip today on this rock that has zoanthids / mushrooms and green start poylps and this leather coral. Just got home from work turn the lights on and seen this

 

[Cherim7]

Looks like it is shedding. Happens every once in a while with leathers. Keep an eye on it.

 

[Morgosverlo]

Not dead. Just give it a little time.