Lower fan leaves rusty with brown tips curling down?

Cheif205

Member
Need some advice on what's going on!! My setup is 400w hps in a 2x2x5 tent growing in some plain soil and using fox farm trio but I haven't used any nutes the past two weeks to try to determine the issue, also I tried watering with epson salt thinking that it would help but still no improvement, any ideas?
 

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