Red Scolly suddenly not doing well

[Piggyback]

Hello all,

I have had a Red Scoly that was living life, fat and happy. Though today I noticed that it had black marks all over it and is retracted.

Some additional information:

Salinity: 1.026
Phosphate: 0.1
Nitrate: 20
Calcium: 400
Alk: 9
Mg: 1250.

Last week I did add an AI Blade to my reef led50 to help my sps corals. Could this be a case of too much light?

Thanks

 

[MnFish1]

Any new fish that may be picking on it?