It's just the one plant doing this. The leaves look like heat stress but it's only 75f tops. They're also much lighter green on the new growth as you can see. Feeding at 6.8 for pH with added calmag, under a 600 watt hps/mh conversion bulb.
The plant did this before when it was much younger in a 1 gallon pot. It's in a 3 gallon now, using sunshine mix4. Root bound symptom?? All the older leaves are fine looking, just the new growth within the last week or so.
In the group shot, it's the one in the left top corner.
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