Calcium problems.
Bump up co2 and effluent rates both preportionatly(sp?) and monitor results.
Alk should stay (close) to the same while Ca ++ levels will rise.
I would refrain from adding any Mg until yor reactor has been dialed in to meet your demands.
Then it may be a better time to test, and add if needed.
What is your alk and Ca++ now?
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