falling calcium reading even though using CR

[chercm]

falling calcium reading even though using CR, i have been getting my alk at 8DKH measured using hanna .

i am using ARM extra course media.

even though i am using SKimz cm122 , do i still need to manual dose calcium ? need some clarification on this

thanks

[bertoni]

How much has the calcium level been dropping, and is the magnesium level stable? If the magnesium level is rising, the media might have a bit too much magnesium in it.

[chercm]

Calcium have been in the range of 320 and I have added grotech mg as arm seems to have low mg


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[chercm]

i watched this https://www.youtube.com/watch?v=gwlvfgDvQqg and seems that he is also having low calcium that he needs to dose separately even though he was able to maintain alk

[bertoni]

That shouldn't happen unless the magnesium level (or some other metal) is too prevalent in the media. Has anything other than magnesium been dosed into the tank?