3 of my 1 month old plants are yellowing and drooping. It happened very fast, like within 2 days. It may be from overwatering, I water each plant about a half of a water bottle. They are in 1.5 gallon pots. They are growing currently in a mixture of organic potting soil/peat moss and 15% worm castings. I dont have pictures sorry, but my question: Is this nitrogen deficiency? If so, how do I treat it fast? I know you can buy spray but is it better to mix alfalfa in the soil?