I just learned that if you have low CO2 due to high scrubber algae growth, then the algae will start assimilating bicarbonate (alk) instead, but I haven't heard anything about growth affecting calcium uptake.
specifically:
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Alkalinity may in some cases be decreased, because of algae's ability to use bicarbonate to get CO2, but this depends on how much CO2 is in your water, and how strong your scrubber is. If you have lots of CO2 (low pH), then alk will not be affected, and pH will be raised.
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Algae Scrubber Basics!!! GOOGLE "algaescrubber zoho"
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