Leaf

That looks healthy to me.. much more green tho and I’d say yes Nitrogen excess. Also, look for some glossiness too it. That’s the obvious N toxicity symptom.. darker and glossy looking. The red petiole / stem can be from strain or lights and it’s not to worry then. But it can be phosphorus deficiency symptom..

Lead looks great just the right amount of nitrogen :) Purple is common it can be affected by colder temps or just part of that strains Genes. Keep up the good work

some stems are purple in cannabis. I would not think to much about it. LST or LEDs can turn them this colour. Do you happen to have any other photos from your grow?

@420USA Gday Mate I think those leaves are fine just wondering why you are doing defol? those leaves provide energy to the plant and removing them should be avoided unless needed