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[APD] Hoagland's MgSO4 Ca(NO3)2
When you make Hoagland's solution, do you use hydrated MgSO4? If so, how do
you know what amount to use since the ratio of H2O is variable?
Is anyone using calcium nitrate Ca(NO3)2 for nitrogen in their aquariums?
This would help to alleviate potassium excess without resorting to ammonia
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