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I have found that even calcium loving species can get by with only 1 to 2
ppm Ca... of course this was in a situation where the concentration could
go no lower due to massive replacement of media. Likely, 10 ppm would be
more than you would ever need. This translates to about 25 ppm hardness
due to Ca which would probably (assuming a Ca:Mg ratio of 3:1) be a total
hardness of about 30 to 40 ppm (or about 2 gh).
Calcium deficiency is characterized by twisted new leaves with the
eventual death of the meristem (growing tip). It is almost identical to
boron deficiency which Paul K. has mentioned in the past.