First Week in Flower

I am growing kgdp I transplaned them into 2.5 gal buckets of hydroton 3 days ago. Now my leaves are turning yellow on some of my girls. Im using gh micro,gro and bloom. My ppm is 1050 and ph 5.9. I am new to this both the site and grow. My girls are clones 4 weeks old just moved to flower room. Any help would be appreciated Thanks