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

[Trigger Man]

So recently when testing my DKH parameters it has been decreasing from its usual 8.5-9 and slowly getting to around 7.5 before my daily dosing of 60 ml DKH and 60 ml Cal. To raise my Alk I've now started dosing 80 ml DKH and 60ml Cal a day (Calcium stable at around 450). I have also started two weeks ago to dose the weekly Tailored Aquatics Mg for maintance (following the directions on the label). Over the last month and a bit I have added a couple more SPS colonies as well as a few larger SPS frags. The coral growth is good, but just wondering why some of my coral tips are now flouresent green?