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I don't have any idea if low magnesium levels would cause sps corals to fade,
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If Mg is low your corals won't be able to utilize Ca even if you have plenty of it.
Jim, how new are your light, how long have you had the corals in the tank? I've been waiting patiently for several weeks for my sps to come back to color after upgrading my light. I have also switched to reef crystals for the added trace element. I found that IO just doesn't cut it for a reef system, it can't keep up with the demand for Ca etc.
I have done a couple of large water changes and things are progressing faster than before.