Are you using RO water? Have you checked what your Ph is coming out of the RO? I have seen some cases where they had a low 7 coming out of their RO and they had to add buffer. As for the Calcium, Alk. When you add Calcium, do you do it over a few days, or do you dump alot in at a time. I used to dump to much in and from what I've read and tested to much affected other test, like my Alk and and Ph, Depending on what kind of calcium your dosing, some can have effects on Ph is dosed to much right away. Good luck.
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