Greened out sps

[Proteus]

I have a red convexa. That's bright green. Good polyp extension. But little growth. Can't understand why it's greened out.
Also have others that are showing green growth tips. Ie. purple poison shortcake and purple stag.

Any ideas why.

I use ro/dI.
Cal,alk,mag are stable with no big swings
Po4-0
No3-undtectable
Salinity- 1.026
Temp-76

Radions at 18000k at 45%. Going up 5% every 2 weeks