ok so lets see if I got this right. at 4ml/gal you were causing percipitation and now your down to 1.67/gal and tyour finding you Ca is dropping.
seams pretty simple.. the number you want is between 1.67 and 4.
so try bump up your Ca additive a bit, say 2.0/gal reduce testing to every second day while you dial it in. once a week is how often a known stable tank can wait.
I personaly don't like the home made dosing as I find the consistancy of it isn't the best, but some people like it and have good luck.
Steve
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