My guess would be nitrogen deficiency which could be caused by lockout in the media from to much fert or keeping the soil to wet + the fert. I have been experimenting with lots of things this year and after too much fert my plants looked like that and continued to get more yellow until I treated them with Calcium Nitrate. I also tried MG, epsom salts, and fish emulsions with kelp alone and in multiple combinations. The Ca(NO3)2 worked best, as in all plants are 100% recovered, so my assumption is that from over fertilizing the plant I locked out the nitrogen and the plants couldn't get it until I provided a more readily available form. I'm no expert though, and it seems trial and error is the best way to learn.
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