some of my leaves tips are curling up witch exhibit signs of magnesium deficiency "praying for magnesium" i also have a recent outbreak of spider mites some leafs got hit hard could that be the cause of the yellowing and dying tips or is it a over fert im using small doses of organic botanicare nutrients 2 400 watt mh bulbs all proper ventilation and circulation temps at 75-80 humidity is at 65%, and my p.h is at 6.6 somebody please help i can provide more info if needed im in about 3rd week of vegg.