These girls are hanging in there. Opened tent early morning and found some of those pesky rust spots. Removed as many affected leaves and found the plants noticeably fattening up. Regarding the rusty spots, when I rub between fingers it doesn’t come off onto my fingers. So probably not a fungal infection. Perhaps a magnesium or calcium deficiency. Can’t be nutrient burn as I’ve kept those ppm’s under close check! Seems I have new problems with this new approach of holding back and verifying nutes (PPM and pH) and water until needed.
