Purple Valida Not Purple

[Cibo]

I bought from a member a frag of Purple Valida it was purple in my tank for a short time now its a real cool iradesent green. I know that I should expect some color with diffrent lights but this is a complete diffrent color is it normal for such a big color shift.

thanks

 

[Salty Dog]

check your water first. Alk is huge and will fade sps quickly. 8-9.5 DKH is a good zone to be in. Nitrates will turn coral brown, do you cahnge your water weekly? how much do you change? Run some GFO to keep your water pure