Can adding Mg or raising Alk make sps tips turn Flourecent green?

[tang daddy]

my deep water was originally all green under 400w but now with t5 body is going purple hue and tips are flourecent green. Did you change your bulbs? Maybe when your Ca and alk levels are in check plus you're dosing Mg it may have made your corals colour up different. I can say that my freind fragged me a nice piece it was brown for a year never grew but with my t5 it has put on half an inch and tips are flourecent green aswell only I never dosed any Mg until a week ago silly me...