Ak 47 auto Why my cotyledon getting yellow And the...

Don't worry about the cotyledons, their only purpose in life is to protect the growing tip as it pushes through the soil. They have no influence on the plants life once th seed has sprouted. For them to go yellow and die/wither away is completely normal. If you are growing in coco, you will need to feed from day one, probably why the plant is so small.. 18/6 is the optimal light schedule.

Cotyledons will do that, it's really nothing unusual. They're only there to help shed the seed husk and provide a source of nutrition until the root zone develops a little. The rest of your plant is getting a little pale though. If you're not feeding yet it's definitely ready. In coco you should really start feeding right away, starting very dilute.

Hi, your plant doesn't get enoug nutrients, that is why she is pulling from those leafs and they turn yellow. So you should check your PH if that is the correct range if so up the nutrients a little bit. But go slow, toxicity is always worse than deficiency. Hopse this helps.

you need to feed your plant,shes hungry