Mostly green?

[CNC_Lou]

Hey guys/gals
so my tank has been up 1.5 years and cant seem to keep original colors on my SPS
they are existing but seem to balance to a green instead of original color.
on a couple there is definite encrusting growth.
32 HD 300 PAR (Photone) peak

4hr , ramp up down 2 hr. I’ve tried many different light period but they seem to start getting lighter. (Bleaching)
On the other hand my LPS look great.
PO4 .06-.08, NO3 <10ppm, Kh 7.8-8.2, CA 430, MG 1380
Thank!

 

[vetteguy53081]

Most get their colors from algae within known as zooxanthellae and controlled by light and color balance from lighting

 

[ReefEco]

Too many factors to even begin to guess - lighting, blue balance, trace minerals, supplemental feeding, photoperiod, etc. Your tank does look great!