BigBlonde
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The lower leaves turning brown and dying shows that there may be a mobile nutrient problem. My first guess would be lockout from over watering, but it certainly could be VPD related, or both, or other issues. They don't look under fed to me. They look like they are not using the nutrients they have. My approach would be to try to save the plants to learn what went wrong. Controlling the temperature and watering would be a good place to begin.