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

[tang daddy]

tips being green is a tough one... I've had awesome purple green sps in other persons tank turn brown and green for a long time and after changing lights they started to colour back up. Everyones tank water, lighting, flow a params are different. In mine for instance the parts of sps that get less light have a greenish hue while the rest of the coral is a different colour. And other pieces have a brown colour in the darker areas.

Here's my question tenius usually have blue tips are you saying that it would be green in your tank?