AsNoriuanswered grow question 5 months ago All 3 shows overwatering and ph issues, that stupid grow partern can be caused by too intense wind too, but I feel from photos that its those.
Plant 1 could be twins, one seed two plants.
Plant 2 struggling a lot.
Plant 3 only weak stem, but purple color just gives more confidence to my bet.
Id its soil, i would not water for one week or more ....
If its coco, triple check ph, temps , humidity and wind.