magnesium def dude,get some epsom salt and either add 1/4 table spoon per gal,mix it with ur nutes, water. Or foliar feed spraying the tops and bottoms of leaves. U using hard water?
Whats up dude,use a vicks cool mist vaporizor and allow afan to blow into the mist which not only raises humidity, but also mists ur plants,so fill it with either spring water or distilled water,it works within minutes,
regards,
SB