Is this lighting damage?

[Backreefing]

Hello I’m thinking it’s to much light damaging this yellow scroll coral.
But I’m asking other options. Is this light intensity damage or maybe parameters? The lights are metal halide with Phoenix 14 k bulbs.250 watts DE . It’s been in my aquarium about a week. The previous owner said it was in 300par , LEDs and maybe t5 combo .
my parameters are
8.6dkh
12nitrates
.060phoshate
78-79degrees temperature
35SG ( refractor. ) yes calibrated
I checked [email protected] this morning. Note it’s a API kit and I haven’t checked ph in a LONG time . Maybe a year ?
Today I did a large water change as this aquarium seams to kill everything but acropora. Strange? Thoughts???

 

[Flux Capacitor]

Photo?

 

[Backreefing]

Sorry forgot

 

[X-37B]

Possibly? How far from the halides is it.
I run the same lighting and my lights are 14" off the surface.
My scroll coral is on the bottom of my 120.
Just took this pic of it.

 

[Flux Capacitor]

It could be from the lighting. Are you able to put it on the bottom of the tank? See if it starts to recover?

 

[Backreefing]

Oh the halides are about 9” off the water in a canopy, and it’s 10” below the surface. But not directly under the fixture.