1200 isn't too bad. I doubt you would see any kind of effect from Mg level at 1200.
Even at lower levels, you don't see direct impact from low Mg...but it then becomes difficult to maintain Ca/Alk levels. If you don't maintain Ca/Alk THEN you have problems.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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