Hey guys. This is my first CFL grow. I have 4 plants about 2 1/2 feet tall, currently on day 32 of flower under about 500w of 2700k and 6500k mixed light. The heat is constant 74-78 F and upper 60s during dark. They are growing in 1 gal pots in FFoF and I use FF nutes. I am not exactly sure of the strain because it's bag seed. Anyway, I have one plant that has maybe 3-4 water leaves that have yellowed as you can see in the picture attached. Is it nute burn? I follow the fox farm nute schedule to the T, except I haven't done the sledgehammer flush yet, which I probably should, yeah? I heard some yellowing in flower is normal because a lot of energy is going to make the buds and not the rest of the plant? Is that true? How do I counter this?