SPS turning green...?

[ChronicReefH2o]

My concern are SPS corals are turning green? What could be the reason for SPS too morph to a green color from a vibrate coloration.

Parameter are listed below (all parameter are solid and stable)
Salinity - 1.025sg
Temp - 78F
Alkalinity - 8-9 dkh
Calcium - 430-440ppm
Magnesium - 1370-1430ppm
Phosphate - 0.18ppm
Nitrate - 2-4ppm

Lighting are 4 T5 bulbs in the order of front to back.
1) ATI Blue Plus
2) ATI Actinic
3) ATI Purple Plus
4) ATI Blue Plus

Tank is a 4 feet by 2 feet by 1 feet frag tank. The tank has been running for 2 years going on 3 in July. SPS have been accumulated to the tank for about 2 months maybe longer.

 

[Pslreefer]

Po4 is kinda high but I don't think that is why? How long have you had them in your tank?

 

[cboltsd]

Are you dosing anything else for trace elements? I know excessive iron may cause the corals to turn greenish.

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[ChronicReefH2o]

I am currently only dosing Alkalinity, Calcium, and Magnesium from BRS 2 part. As for Phosphate, I realize that the values are high, but in the process of lowering them down to 0.03 to 0.08. SPS have been accumulated to the tank for about 2 months maybe longer.