Having trouble with the green color

[palyam]

For some reason for the last few months I have trouble with keeping the green color in my SPS corals. It just fades away, turns into pale green-gray. I have no problem with blue, purple and red.

Parametrs are stable:

CA: 430

Alk: 9

Mag: 1280

PO4: 0.05

NO3: 1

Lighting, 6 T5 Fixture: 3 KZ Superblue, 1 KZ New Generation, 1 KZ Daylight, 1KZ Fiji Purple

What could be the reason? What to your experience influence that particular color in SPS corals?

 

[Felixc395]

Have you ever dosed iron in small concentrations? How often do you do water changes? Maybe you're not replenishing trace elements as much as you should.

You say you can keep blue and purple, but to what extent? If they're faded or light in color I would check for nutrient depletion first before anything else.