leaf coloring

Mutation .. already mentioned previously- just adding to the total who think so

If it would be soil i would say bump magnesium up, Thats the issue, what caused it in hydro i am not familiar. In soil it would be bad watering ( overwater edge), ex nitrogen toxicity fading away or just simple lack of magnesium. Epsom salt to the rescue.

Hello my friend, this pigmentation in the leaves and the deficiency can be caused by a low levels of certain nutrients. But you provide a EC 1.5 what should be enough. So we are almost certain that it is a nutrient lockout. But the difficult part here is that you use soo many different nutrients. The pigmentation can be caused by not enough magnesium, nitrogen, or phosphorus. This is because a lack of certain nutrients can cause stress to the plant, which can trigger the production of anthocyanins as a protective mechanism. I would do a bucket change, check all my nutrients and write down the NPK ratio to see if it is within the right ratio for this phase of the grow. Keep track on the pH value that should be around 5.8 and start with a fresh bucket to prevent further deficiencies.

Its just a genetic thing going on. Looking back through your weeks, I can spot the discoloration going on. I have had plants I called peaches and cream. I would just make sure your ph and ec levels coming out of your planter are fine, and if they are, their golden.

I think @Polyphemus nailed it, Some leaves might look like this from pests, but it should be all over the leaf not just divided down one side. Can't hurt to check on the underside and confirm there are no pests. Good Luck!

disease or gentic mutation? if not spreading to other plants, more likely mutation but not guaranteed. Sometimes they have to share the same substrate for it to pass on as opposed to just being nearby. depends on the infection. when i've had plants with odd spotting of leaves not related to nutrients, it never goes well. usually some weak ass plant with weak flowers. if just on one leaf.. remove it, lol.. ugly to look at :P