[Ganja Guerrilla]

classic magnesium defeciency,

1 teaspoon of epsom salts(mgso4 magnesium sulphate) to 1 gallon of water, water each plant 1/2 a quart of this solution

since it is pretty severe def I would also take 1/2 a teaspon of epsom salts to a litre of water and foliar feed the plants ,turn the lights of as not to burn the plants & spray both sides of the leaves well

you should see some results within 24-48 hrs

dont water for a while the plants have been thru alot