Maintaining purple on sps

[dviper150]

I'm having a hard time keeping my sps that deep purple color that some have. Anyone know the best lighting/par to help them keep that purple?

I got a candle light sps frag recently and when I got it, it was deep purple and looked really nice but now the purple is fading away.

 

[squaretankguy08]

How are the other sps in the tank?

 

[dviper150]

Everything else is doing good. I have good red, pink, green, and blue. Just the purple is fading from some sps.