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Not seen anything like this before nasty it’s strange how exactly half are affected out of the crop pal real head scratcher are the seeds or cuts ?? Are they sharing the same res and feed schedules ?? Very very strange mate
I can spot Calcium deficiency in one of the leaves mate.
It could be due many factors. From environmental to pH issue. Some phenotypes are like completely different strains. While 5 of them can be happy at 24 degrees and 50% humidity, the other 5 might need higher stats.
There all the same clones of the same plant. Same enviroment and same feed its got me puzzled they have great root growth and there growing very well just look really weird its got me puzzled. The ph is always 5.8- 6.0 in coco and the temp has been a steady 24-26 when lights are on