Yellow side of leaf on mew growth?

These thing happens from time to time and usually have no cause or problem, it is just a "funny" leaf. After you grow for a while, this "mutation" occurs quite often, roughly one in every 15-20 plants will show this anomaly, it seems to be quite common in cannabis. Sometimes it is only one leaf, other times the plant will be affected to such an extent that roughly one in every 10-15 leaves will show this yellow discolouration, mostly with straight edges to the yellow patch, which makes me think it is linked to the leafs' veins, maybe something like clogged arteries in humans. Hope this helps,....... Organoman.

I can't believe they've stayed this healthy with no feed.As soon as you see your first true leaves they want food.Its hard to be certain with such a little amount.The food will sort it out.If you haven't got coco specific food you will need some extra Calcium though.Advanced Nutrients Cal-Mag is one if not the best as it has added Iron and Amino Acids.They say Iron is one of the missing links in Non specific coco food.

The plant look very healthy and since it is just on that one leaf it could just be a genetic mutation.