I would adjust the mix to meet the levels of your main tank with suppliments. Starting with Mg.... then Ca and Alk. I find if you bring the Mg levels up first then the CA doesn't precipitate.
I am sure you know where your levels need to be but here are mine anyways:
MG: 1360/1400
Ca: 435
Alk: 3.45 Meq/L
Salinity: 1.024
Rich.......
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