What’s happening to my bird’s nest SPS??

[corals.la]

I’ve had this gorgeous green bird’s nest SPS for a few months now. It’s mostly been plush and healthy. Recently, I noticed it’s looking different. A couple parts of the tips look boney. Is this a sign that it’s growing or is it unhealthy? Not sure if there’s too much light. It’s been doing really well in the same spot so I didn’t think the light would bother it. I circled the parts of the picture where it’s changed so it’s easier to see. Any help would be greatly appreciated.

 

[MERKEY]

Without better pics its hard to tell.

It could very well be new growth

 

[Sam816]

Any 'reef compatible with caution' fish in your tank?
Post some pics under white light pls

 

[blasterman]

Better picture with whiter light please. I'm seeing bare spots - RTN.

Rapid dive in phosphates is always my first suspect with sudden tissue toss on birdsnests.