ya that frag looks like its pretty much toast.....like Denny said, your tank is still fairly new...stick with montis, and birdsnests.....maybe a milli.... these SPS are quite a bit more forgiving then most SPS and are great corals for the ego.....place them a little lower in the tank(save the uppermost prime spots for more light thirsty SPS) and see how they do.....after a couple monthes your tank may better accomodate some of the harder to keep SPS....
Ca, Mg and Alk form what they call the "big three"......if one or more of those numbers is off it makes maintaining the other parameters very difficult....my advice if you want to test and dose and do things by the book would be to pick up a Mg test and have all three additives......it sucks to begin with, testing and testing and then testing some more to figure out where your at and what your tank is consuming, but after you've got it dialed in, half the battle with SPS is won.................
.............or you could just do what I do and dont test or dose a thing
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694