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But I guess what I'm wondering is, let's say I test my Mg and it's at a little lower than desired levels (e.g. 1000ppm), and I purchase something to bump it up to 1400, would I see a difference in my corals? Will I see better color, better growth? Or am I just making sure my Ca doesn't crash?
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IMO you don't want to super load your tank with any one substance. Mg is a slowly depleting element in a reef, much more so than Ca and Alk etc. If you add too much Mg (which we know is needed to make Ca bio available) you run the risk of precipitating the access Mg with Ca+ in you system, and will cause your Ca levels to drop faster. This was noticed in my tank once as aragonite turning into rock. I don't believe it is harmful to your corals, but it is a waste. I would keep your Mg at the high end of normal, around 1350 ppm, at this level your corals can best optinimize Ca consumption at around 350 to 400 as stated above.
When my Mg levels are down I noitice less Ca consumption when testing, which coralates to less coral growth. Hope this helps