Nitrogen (N) deficiency is what you are showing. Could go into toxic salts too so watch the other plants. N is the one thing that locks out most of the time too. You can try to change the nutrients and give enhanced N or you can flush the whole medium for a few days then go back to a full NPK. You can also treat with a dose of N as well like seabird guano, fish emulsion and blood meal or use an enhancer that has an extra dose of N.