Ryhce, I suppose it could be that. Since I am not a botanist, I couldn't rule it out. However I am pretty sure it was the nitrogen thing as I have seen it before in one of my plants. She is still producing pretty nicely. I pulled a couple of yellow leaves off the bottom of the largest Fantasmo tonight. So far that is all of the yellow. The end of grow pictures of the entire room are going to freaking top notch man.