I am new to growing indoors and started with one autoflowering strain called Hijack... Everything was going great and its been growing for quite some time now, however i discovered some sort of deficiency. The upper stems are turning red and the fan leaves are getting yellow by the veins and branch outward but the entire leaves aren't yellowing at all, just from the veins out. I've been giving it doses of nutrient solution only once a week for 2 weeks now. I have no clue what is happening to it and i wanted to fix the problem early. Someone PLEASE HELP. I would post pictures but i have no idea how....