Your feed is out of wack pal. You have clear mag. And when calmag is cut out you'll see other nutrients uptake been stalled. If you are using soil and have no calmag on hand then get some Epsom salt in your house or ask female friend and get some calmag and get photosynthesis going again.
Good luck
I would not say they look that bad. The leaves are still green, If you have the time then I would let them continue. You will learn more recovering them then you would starting a new batch.