Why is my leather turning black?

[Red Sea 500]

Any ideas? All my other leathers are doing great.

 

[exnisstech]

Sorry I don't know why this happens but I have had it happen to a sinularia twice. Nothing stinging it. I cut all the black off and it bounced back fine.

 

[Red Sea 500]

Sorry I don't know why this happens but I have had it happen to a sinularia twice. Nothing stinging it. I cut all the black off and it bounced back fine.

Ok thank you