They both seemed great a day or so ago. Leaves are developing broad brown/rusty splotches? Any ideas?
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Looks like you dripped some water on it while watering. Then your lights lensed the drops, like a magnifying glass. Nothing to worry about. Any time you get water on em, just dab it up with some TP or napkin.
Defoliate any overlapping leaves. Those will create moisture drops where touching. Also, looks to be over watered a bit. Heavy drooping leaves full of water weight.
Edit: There is a chance that it could also be Boron deficient. Solve the above first. If it continues to develop, tag me for a look and further diagnosis.
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First 2 pictures to me look like the beginning of ph lockout the 2nd pic of the smaller plant looks over watered
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Is that a blended medium of coco and soil?? Super tight node spacing and like @Budbrother mentioned with the leaves sweating on each other. Raising your light height and intensity can promote better node spacing and air circulation. What’s your watering and feeding routine…PH and PPMS 
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COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)
-What strain, Seed bank, or bag seed (photo or auto)
-Age of plant
-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
-Vessels: Type and capacity of container (fabric, plastic, etc)
-PH and TDS of Water, Solution, runoff (if Applicable)
-PPM/TDS or EC of nutrient solution if applicable
-Method used to measure PH and TDS
-Indoor or Outdoor if indoor, size of grow space
-Light system List brand and wattage/spectrum
-Actual wattage draw of lights
-Current Light Schedule
-Temps; Day, Night
-Humidity; Day, Night
-Ventilation system; Yes, No, Size
-AC, Humidifier, De-humidifier,
-Co2; Yes, No
If growing Hydro some additional questions:
-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution
Always try to upload a clear picture in white light of any issues you may have to allow the community to assist you.
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