Sunset monti

[fredfish]

My sunset monti is growing well....... But, it turns from a nice reddish base on the edges to purple in the center. The polyps are still green/yellow and it looks healthy. Not sure if it is a light issue........ I'm using two Kessil A360w's over a 36" x 18" x 18" tank. They are ran at 40 to 50 percent intensity and my water tests good.....
Ph-8.2
Po4-0.02
Mg-1400
Ca-440
Salinity-1.026
Alk-8.4 dkh
Any ideas on why it's doing this?

 

[mvm]

Sure it's not a rainbow?

 

[snowmansnow]

I call for a pic

 

[fredfish]

I will be able to get a pic of it tomorrow......... My nitrates are at zero according to lfs nitrate test. I test everything else with Red Sea and elos test kits. It is high up in the tank, but I am not running my lights at 100%........ They are at 50%. I could try slowly ramping up the lights to see if that improves the color.

 

[fredfish]

Here is a pic of the monti......
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