Light green and curled leaves

Ok family i have come across another issue. One of my 5 plants has the fan leaves getting lighter and curling down a bit. The buds and sugar leaves look fine. Closet temp at 73f humidity at 40% an have excellent air movement with multiple fans. I an growing with “living soil” brand super soil so i have only been feeding with water phd at 6.6. I am in week 7 of flowering. It has the most bud of all the plants. Have i consumed all the nutrients in the soil? I tried not to overwater so as not to wash out nutrients. If i have should i start feeding. Or is something else going on.

Perhaps this may help.

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As close to harvest as you are, it’s normal for the plant to start cannibalizing itself