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Re: Calcium

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.