Leaf edges a bit yellow and now some yellow mottling. Signs of the same problem?

Short and sweet i copied and pasted last couple sentences with some tidbits added: so keep eye on those few leaves degredating, could be nothing since it is isolated and could just be shedding them if lower on plant or well-shielded from light. Watch for advanced symptoms of P or K tox (get a chart!), and eliminate possibility of a S-deficiency as cause of chlorosis in new growth (no red streaks in stems). ------ how i got there.... These are different symptoms with different causes. How the damage starts, where it is on plant and how it progresses helps diagnose. more than one thing can cause interveinal chlorosis -- palying between veins as seen in your pictures. light damage could start out this way -- though i don't know if it's technically chlorosis or not? if this is only the top most leaves, that brings light into it, but if it's lower on the plant you can easily eliminate that as a potential cause. in previous question you had some symptoms around the serated tips on leaves. That tends to be related to potassium(K). Looks like that has abated, at least. it will help you to speed up learning curve if you keep track of weighted-average of n/p/k/ca/mg/s percents relative to proportion of formula. e.g. i have a 5-12-26 and 15-0-0. i use 3 of one and 2 of other. choosing these values for ease, not reality. calnitrate is 2/3rds the dose x 15 = 10. So i am adding a ratio of 15-12-26. i'm not busting out my ingredient labels. this limited example exlpains it. i also have a nutrient ppm calculator, but the ratios will work well ontheir own and basic common sense on overall EC fed will allow you to see what is you are feeding in a resolved way and can more easily eliminate possibilities of the symptoms you see. lots of things cause internveinal chlorosis. it's a wild guess without more information. your canopy looks to be in good shape. New growth has some chlorosis, which is why i thought K or P was too high. This is common with "bloom" instructions. so if oyu see this progress, reconsider their instructions. i don't see many leaves with the issues of these pictures given. you say they are few and far between. this is a good thing. if they are older or shielded leaves, the plant may just be shedding them. in either case, when it is a very limited symptom, be patient. let it play out a bit. see how it progresses. even location on plant is important to diagnosing. if it happens at top, it's an immobile nutrient. if it happesn at bottom it is a mobile nutrient. there are shades between, too. diagnosing is always some part a guess. once you have more familiarity, it'll be 99% certainty 1% guess. Get a leaf chart. Keep asking questions as you learn, but start using one to form our own opinion on things. Once dialed in the type of stuff you will react to will be minor, slowly progressing things requing small tweaks, especially if you track how you feed and use that to help diagnose as you gain more experience. the shared folder from my google drive link in main profile comment section has a leaf symptom chart. google image search can easily find one too. some are more detailed than others. The one i prefer has worked well for 4-5 years so far. Feel pretty confident in the information it gives. one last thing, if i am wrong about the elevated p or k causing chlorosis on new growth, it could be low S -- this will be supported by a further symptom that is hard to miss. This would coincide with red streaks in the stems/trunk (Not leaf stems, aka petioles, that is different symptom or related genetics/LED use) so keep eye on those few leaves degredating... could just be shedding. Watch for advanced symptoms of p or k tox (get a chart!), and eliminate S-deficiency as cause of chlorosis in new growth (no red streaks in stems)