FastBuds x4 different strains DWC

Girl number 3 is sensitive to nutes so ive emptied her bucket and added plain tap water with just root stimulator and hydroguard and after a day i can see improvement alrdy, her new growth is green again. All the other 3 girls are on the same regimen as before. Ph fluctuates a bit but i am keeping an eye on it all the time trying to keep it at 5.8. EC is staying about the same but obviously when adding ph down it rises the EC slightly. Plant number 1 1.0 EC Plant number 2 0.8 EC Plant number 3 0.6 EC Plant number 4 0.8 EC