IO mixes out to these for me
ALK: 11
Ca: 380
Mg: 1300
I up the Ca to 430 and Mg to 1350.
10% water change doesn't affect my overall alk in my system.
What test kit are you using and how old are they? Also, remember not to do your testing right after water change or right after you dose your cal & alk. Give it time to mix through out the system.
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