I have all of a sudden been getting more and more yellowing of my leaves on 4 of my plants during flowering. They are in 1 gallon bags, and are in Pro-Mix perlite combo and been given nothing but organic nutes, they are clones. I have been giving them nothing but flowering nutes about 30-40ml once a week. Do i need to add some grow for some nitrogen? or is it a magnisum issue?? I had them really close to my 600 watt hps for a few days, could that be it? they still have a ways to go. What are everyones thoughts