Came back home today and it was fine. Around 8pm I noticed some dots (photo with lights on). And now around 10pm, it's puffy and really bizarre looking (photo without lights on).
My tank's about 6 months old. I do weekly 4-4.5 gallon water change on my Nuvo 14 using reef crystals.
I use AI Prime 16HD using modified Saxby schedule. I tested my PAR when I first got my light which read 100 near the sandbed. Since then, I moved around the intensity a little.
I hope she's okay. I have another hammer coral right next to her, and that one's doing fine. Here's the comparison photo (edited for clarity). Thanks for your response!