Last Pineapple Poison

Hello to everybody, here the fifth week of flowering. At the beginning of the week she showed some yellowing leaves on down-side part of the plant so i did a little defoliation. She are starting to get colour on the leaves and olso in the middle of the buds, i don't have a good camera on my phone but with the microscope i can see the violet inside the buds. The trichomes are starting to be dense all around the buds. I did watering three times: - 2 L water + pH-down 3 gocce/L (x3) pH 6.0 - ppm: 169 - EC: 0.3 ms/cm - T: 23.4°C