Acceptable day to day changes in parameters?

How do I find where to do this
Read the Supplementing Daily section. This is the manual that came with the Red Sea Foundations kit
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There's no possible way that magnesium will vary by 25 ppm in a day unless you are letting the salinity vary. Real magnesium consumption is typically 0-2 ppm per day, about 1/10th of the calcium consumption, or less). Calcium will only drop that much in a high demand tank, where alk is dropping more than 3 dKH per day.

Boosting calcium or magnesium by 25 ppm in a day is fine, assuming it is a reasonably pure supplement.
If the rate of consumption is so low, how did my mag reading drop to 1150 so quickly? Also why is the difference between a reading of 1150 ppm and one of 1350 ppm supposedly so important?
 

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