Itโs Nitogen deficency, Not you PH in the soil, 6.5 is good donโt know what the other Person is talking aboutโฆ 6-7 oh is still fine, 6.3-6.5 for soil is Perfect, but if your PH is off it can block nutriens uptake but these looks like normals Noteogen Deficencyโฆ ( yellowing leavs, staring at the bottom of the plant / sun leafs ) also the brown spots mean that you have a Cal or Mag deficencyโฆ