SPS loss of color

[Msleckro]

I have a 65 gallon tank with a DIY CREE LED light fixture. I have been growing SPS and LPS very well. Just lately I've noticed some color loss. The corals all seem to be growing still. Could the lights be too powerful? Or is my color temperature too low? Any help from fellow LED growers would be great!

My tank parameters are:
Salinity- 1.025
PH- 8.01
Temp - 77.5-78
Alk- 6.5 dKH (I know its low but i can't get it to go any higher)
Calcium 400 ppm
Mag- 1320ppm

I'm using phosban, carbon, and Pura complete.

[ja4207]

Maybe the LED or maybe it's Po4.... I wouldn't troubleshoot further until you've ruled that out.