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I have an issue, i have two plants and one is exhibiting an extreme yellowing in the leaves while the veins stay green, but there is no red on the stem. They had started to develop necrotic, black spots on the tips and soon inward; the leaf has since dried up and it came off w/o force today...

so I've got a setup of plants that is in a DWC i self made, and the bottom leaves of the plants are turning a bright orange-yellow. They are just entering the veggy stage a few days ago, and the cotyledons (1st set of leaves, the round ones from the sprout) turned bright orange, and got crispy...