Why do some of my SPS turn green?

[Lionfan]

Most of my SPS hold their color but some of the beige with purple tips have turned green with blue tips. I have Dual 175W 20k BULBS 4"s away from my SPS. I general what does it mean id SPS turn green? Thanks for any help.

 

[twon8]

i have a pink milli that turns green when it doesn't have enough light.

 

[LivingTropicals]

I think it's due to insufficient lighting, insufficient lighting spectrums or a combination of both.

 

[Lionfan]

Twon, Interesting, my pink millies' are OK but 1 looks like it is starting to turn greener. Better up the light, thanks