2 Duncans suddenly going white

[Omarcrown]

Salinity: 1.028 (a little high but nothing in the tank is bothered by it its been like this over a month)
Calcium 440ppm
KH 179 ppm
Phosphates between 0- 0.25
Nitrates 0-5ppm
Ph 8.2
I did feed them Phytoplankton, as well as dropped mysis shrimp to other coral this morning roughly 13 hours ago and they were fine during the day. An hour or so before the tank went lights out they both started looking rough and they still look like so. Hasn't gotten worse but hasn't gotten better in a couple hours.
My other 3 duncan look perfectly fine (5 total) and even have signs of new heads so they're enjoying the parameters.

I also did a water change this morning prior to feeding.

Same duncan 2 days ago

 

[exnisstech]

They look to be under different light which will affect color. Mine will stay closed until a few hours after lights on then open. IME a Duncan that is unhappy with not extend polyps.

 

[Omarcrown]

They look to be under different light which will affect color. Mine will atay closed until a few hours after lights on then open. IME a Duncan that is unhappy with not extend polyps.

Same light, I was just using my phones flash to take the picture since its "night time" for them. Im a 5am wake up so 8-10 hours of light ends around 3pm for them