Added nutes made leaves yellow

I'm growing in a DWC system and planted my clones 14 days ago....the first 4 days I watered with plain phd water (5.6-6.1), then added formulex at half measure but the leaves yellowed so I changed my water and used plain phd water again for 5 day's and the babies looked healthy again. 2 days ago I added half strength formulex again and the leaves have yellowed again ? It seems to me pretty even the half strength formulex is too strong ? But these babies aren't exactly tiny at 6". Any recommendations ? Should I use plain water again for a few day's then try 1/4 strength formulex ?

Buy diff nutes did just the new growth yellow?

No mate it seemed to be the older growth but rapidly turned them yellow as soon as I added the nutes. I used formulex in my last grow (first) for the early days and it worked well.

Try adding some fish emulsion to your mix. Pictures are worth a thousand words