Candy Cane question

[jcs11236]

I have had this 2 head candy cane for several years with no growth. Once i upgraded to new tank/lights a year ago- it grew nicey into around 20 heads. for the past month i have noticed it losing color on some heads. some heads are white but not skeleton. its white flesh. what can be causing this? all levels are fine and steady. weekly water changes. Could lighting cause the cane to lose color? I have LEDs.
My levels are:
Alk 8.9
cal 450
mag 1290
phos .01
all other corals/clams etc are fine

 

[Turbovr3six]

Sounds like they are bleaching slightly from too much light.