My first diary

To me there's no problem other then the PH being off just a little bit in soil its ideal to be at 6.5-6.7 those are just your very starting leafs they always turn yellow after some time . I would keep doing what your doing because if you had a problem you would see it in other leaves as well not just those ones . I would prune those off and keep growing ! Ain't nothing wrong with what I see here . -Happy Growing !

When in doubt, it is always best to defoliate less. Also don't defoliate during the first 3 weeks of flower, you will take the plants energy away from producing bud sites, delaying the flowering. You seem to have left some bud sites with no leaves, every bud site that you want to develop needs leaves to get energy from. Some LST would be good to get a more even canopy and expose more of the mid lower bus sites. As for the lower stems / foliage, bud sites that low you can get rid of (since they will barely amount to anything); as for leaves, there's no point in getting rid of the lower leaves, you gain nothing, unless you want to improve air circulation, at the very least they serve as an early warning system against deficiencies. Hope that helps, good luck

Hey there @bombadil. Plants have 2 types of nutrients called mobile and immobile nutrients. Immobile nutrients CANT be moved around the plant and due to this the symptoms show directly on the newer growth where the deficiency is active. The other type of nutrient is Mobile. Mobile nutrients can be pulled from the lower leaves to be given to the newer growth up top as a survival method so they show symptoms on the bottom side of the plant first. You have a mobile nutrient deficiency evidenced by the lower growth being effected first by the absence. I see magnesium deficiency immediately. You will want to lower that PH 6.8 is to high you will want a PH of around 6.2-6.3 to give better access to all the nutrients including your deficient one Magnesium. Just be sure to give her that magnesium and she should stop showing signs of regression! Please update us on this Bombadil! 😎