You will have to manually dose just a calcium supplement to have a large effect on calcium without your alk sky-rocketing. Calcium reactors and kalkwasser are balanced additives. They add a very small amount of calcium relative to alkalinity.
I disagree that your magnesium level is too low to support those calcium levels. I've never had a problem keeping calcium over 420 even when magnesium fell into the 1100's. I also doubt that your calcium levels are an issue. They are well within the normal ranges and stability in regards to alkalinity is more important IMO, especially for SPS. My birdsnests and pocillopora seem to be the most easily killed by alk swings. I always heard acropora were more sensitive but my experience has been the total opposite.
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Jer
Current Tank Info: 40b basement sump, 40b refugium, 30g frag
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