Lack advice

It looks fine to me, The last Picture looks like your PH went out of range but nothing major. New growth can be a bit greener when its growing quickly. If it looks striped with light and dark green then yes you have an issue. Its best to look at the plant as a whole as you will get a few blips showing here and there. Good luck and Happy Growing

i can't tell if interveinal chlorosis or just the tips starting to burn if interveinal, Mg-deficiency is a good guess. i'd adjust very slowly as it seems fairly isolated and not fast moving, eh? 10ppm might be enough in that context If the latter, up K a bit. same conservative, proportional strategy... but dealing with 2x the ppm with K. may need 10-20 to cause a difference.