As I said earlier, I have this one plant that always seems to have yellowing leaves. I have fed it some 20-20-20 nutes just like the other plants, but this one continues to grow yellow towards the bottom and more dark green on top than the others...why?

Either way, I also wanted to note that I know I made the mistake of having two or three plants in one pot in a couple of the pots. They all started out strong and haven't had many problems thus far, so I figured let it go and see what happens. Learn from experience.