PlantGuy's Magnesium Sulphate- MgSO4 (1lbs)
To make a typical stock solution for feeding plants add 70g (4.6 tbsp) of dry MgSO4 to 500ml (16.9 fl. oz.) of RO or distilled water and then add once a week 50ml (3.3 Tbsp.) of this solution per 100 Litres (26.4US G.) of tank.
This will give you 7ppm (7 mg/l) of Magnesium.
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