Alkalinity drop questions

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I’ve been watching my alkalinity drop this past week even though I’ve been increasing my alk dosing.
My dkh has dropped from 7.5 -8.0 to 6.8 -7. I’ve boosted my daily alk supplement from 50 mls to 67ml without seeing it rise. My calcium and magnesium have stayed pretty consistent at 440 cal and 1520 mg. (Side note I’ve been trying to increase mg as of late). The pH is staying between 7.9 and 8.3
My tank is fairly well stocked but seems generally use approx 50 mls a day.
Would coral growth account for that recent increased demand?
 

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