when you make a thread,
please give detailed information, you basically are asking us to diagnose a stomach ache but not letting us know what you ate at all.
Unless its the pic ur leaves look really dark. And i see some initial clawing. Bc of those two I'm thinking ur pushing too much Nitrogen. U may have a mag def and its ez to treat w 1tbsp epsom salts/gal water spray onto lvs weekly or make a drench with same salts and water