Additional care for plants: supplementary magnesium fertiliser for aquascaping aquariums Dosing is dependent on intensity of illumination, Co2 supply and consumption. Healthy plant growth, prevents deficiency symptoms, ideal magnesium values Checking of dosage with JBL magnesium test for freshwater Package contents: 1 bottle ProScape MG Macroelements. Use daily: 6 ml/100 l for e.g. high power light with CO2, under weak light conditions without CO2: 2 ml/100 l weekly