Blight, deficiency or something worse?

Cannabistattoo

New Member
Please let me know what u can do to get my girls happy again. New leaves are coming in nice and green but older leaves are getting spots of rust and yellowing out. Drying up and dying. Will post pictures. Any help would be awesome thanks!
been in veg for 5 weeks only 11 inches tall
Using a T5 for veg 24hours 16inches away
3 gal bags
foxfarm ocean forest
foxfarm Grow Big
75deg
also have another one under 300wat HPS doing the same thing.
only watering when top gets few inches gets dry elevated for draining
PH 6-7 brita filtered water
image(7).jpgphoto(31).jpg
 

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