HELP! Corals are tuning white

My corals are slowly loosing color from the bottom to the top. This are my sps corals but they are still showing quite a bit of polyp extension? The tips still have some color though.

Ph:7.9

Ammonia:0-.25

Nitrite:0

Nitrate:0

Calcium:405

Magnesium:1360

Alkalinity:8

Im running leds.