Are they all getting the same amount of nutes and water or are you playing it by feel and watering as the growing medium 'feels' like it needs it?
Often different strains require different amounts of nutrients and water. However, as a side note the rapid onset 'could be' related to root issues.
My initial assessment is over watering and nutrient imbalance. I would suggest
- flushing your affected plants with RO water that has been ph balanced to around 6 and has 1tsp of hydrogen peroxide per gallon. Run enough liquid so that your growing medium is completely flushed of nutrients.
- Next I would cut off the affected leaves, your plant will expend energy trying to fix them and it can't, at this point they're doing more harm than good.
- Before you water the plant again make sure the growing medium is dry or barely damp to a depth of the second joint of your index finger.
- For the first watering of the recovering plant(s) us ph balanced water with two tsp of hydrogen peroxide per gallon
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