Green SPS turning white

[Brittanyjo]

I just obtained this SpS. I was told it was easy to keep and hardy, but it is turning white.
Should I frag the green healthy pieces?
Any hope for him?

 

[vetteguy53081]

You can. Likely causes are:
High or false salinity
High alk
High or low calcium
Lack of water flow
Red bugs
Nudibranch
Flatworm
Lights too bright