White Dwarf Auto/fem issues, arrggg!

I am having an issue with both of the White Dwarf auto/fems that I'm growing. The first is finished and harvested, and the second is doing the same premature yellowing of the leaves. My Red Dwarf auto/fem is doing very well, same nutes added,(Advanced Nutrients) according to their schedule. First White yellowed and now the second is doing the same thing, is it me or is it the plant? Thanks in advance for your feedback.
 
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