squirtle My seedling seems to be showing the same dark tent in the spine of the leaf, possibly nitrogen deficiency? Too much or too little I cannot say I am still new

squirtle I would double check PH but seems like nitrogen toxicity from the dark hue and the clawing of the leaf tips, at least you are DWC and can correct it fast I am in soil and have not a clue what to do for my baby 😭