dying Favia anything I can do?

[Shibaken3]

Got this coral from LFS on Black Friday. Was doing good but suddenly it started dying. one of the pictures is from when I got it, one picture is right now. The last picture is my whole tank picture.

The placement was in the middle of the tank and I'm suspecting too much light so moved it to the right cave of my tank.
I also did a coral dip to get any bacteria that may be causing the deterioration.

I have other corals that are doing fine.
The parameter is all good probably nitrate and phosphate is close at 0 but I do have lots of algae growing so I know there is nitrate in phosphate. (Hanna checker)

Is there anything I can do? Planning to do a 5-gallon water change if necessary

 

[blaxsun]

At this point I'm not sure. You indicate your parameters are fine and you've already re-dipped and relocated it. It might help to not stress it further for the next few days, but it's hard to say.