Skittlez and Gelato Autoflower

First grow

Transplanted them into 5 gal pots . Changed their water form clover distilled water that ph was 8, to Poland springs with a 6.5. Hoping that was the issue with the yellow leaves. Also loved the light up, does anyone know when I should be watering them I usually just look at them to tell but should there be a certain amount of days I do it!