What is wrong with my Turbinaria

[Fred5612]

I’ve had it for 4 months, I can see more of these “holes” were a polyp once was and browning on the edge. What’s wrong with it? Can someone give me some pointers? Recently tested my values and everything was in the norm. Would really appreciate some help as I’m quite new to the hobby

 

[supernanoguy]

Post your water parameters.