Injured coral

[KAV84]

Can you help identify what's going on with my WWC bicolor war coral. Was doing excellent, still having growth but now I have noticed the top opened up and appears to be brown with a small hole. Any assistance would be a big help. Thanks

 

[Shep]

A little hard to see with the pic. I would say that as long as it does not look like it is missing tissue or losing color I would not worry too much.