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CaCO3/MgSO4 - how much to add?

Hello everyone,

    My aquarium seems to suffer from a mild deficiency, and I
believe it has to do with my low Gh (judging from experience with an E. 
bleheri and now with my two Rotala sp.). I know that I should mix both in a 
roughly 4:1 ratio (CaCO3:MgSO4)... but how much of this mixture would I need 
to raise the Gh of my 55 gallon by 1 degree of Gh?


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