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Thank you very much, that cleared it up for me and I'm sure for others.AFR is designed with an alk to calcium ratio identical to kalkwasser, which adds a tiny bit more calcium than alk. You will not detect it day to day, but long term, maintaining calcium will typically allow alk to decline, and maintaining alk (my recommendation) will allow a very slow calcium rise. Water changes are often enough to keep calcium fine (it did for me with kalkwasser) but if you use a high calcium much to begin with it will trend up.
It is fine to use a little alk aside from AFR to stabilize things, if water changes alone do not keep it where you want.
Fwiw, calcium is fine at any values between 400 and 550 ppm.
I haven’t looked into the amount of magnesium in AFR or how to use RMM with it, but it should not be hard to implement.