Alk burn or lighting issue?

[Cyberdude]

Alk at 9.6
Ca at 450
Mg 1450
No3 2
Po4 0.13
Sg 1.026

Lighting 2 x hydra 52.

Rest of tank doing great

 

[moatdaddy]

My guess with minimal info is its led directional lighting issue.

 

[Galaxyreef]

Agreed lighting issue