Hello, recently been using the Nectar for the gods regiment the Pro series using them all. Great line and the end product is always phenominal. I am however experiencing this issue with what i believe to be Magnesium. Ive been countering and giving more Calcium(mg) and added some dolomite lime to boost the available Magnesium at a rate of 3 TBS per 5G. I am honestly here looking for second opinions as to what you all VISUALLY believe the issue to be. Temps are 78-82 always. humidity is 45-60 always. pH of nutrient solution is 6.2-6.4 always. pH of soil is roughly 6.7 average. ranging from 6.4 6.8 Use T5's for Veg, light distance isnt an issue.
looks like its not affecting the new growth so i would say its not a problem. probably the plant is just pulling what it needs from the older fan leaves, which is what they are meant to do. you could always top-dress with some good vermicompost/compost and kelp meal.
If it looks like you have a mag def, don't give extra cal cause that makes it worse. http://www.greenhousegrower.com/video/fertilizer-nutrition/understanding-nutrient-antagonisms/