Yellow spots on leaves and some crispy???

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Hi guys I need some help, some of my plants are looking OK, but some have rust spots on leaves and one has a crispy dry leaf underneath I don't have a clue what's going on, they Al just look a bit sad and droopy also, any help please ASAP would be greatly appreciated. They're five weeks in now and shiukf be flying
 

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Post pics with regular lighting. Will make it easier to see. Also you will need to provide more info. AFN has a standard format for the Infirmary.

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)

-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.

-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!

-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)

-Strain and age

-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure

- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....

-Additional info: How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!
 
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