Dying / yellowing of fan leaves VEG state

Newsprout

Member
So I just recently started growing two bagseed plants on my balcony. I used jiffy peat pellets to start them off and transferred them to 6 inch wide pots after they sprouted. They get an adequate amount of sun each day and the temperature hasn't gone below 45 each night (gets to about 65-80 every day) and I water them every few days once the soil is dry an inch deep. The plants started drooping a little over a week ago, so just recently (a week ago) I stopped using tap water and switched to purified. It really helped, but now the fan leaves are all yellowing and dying and I'm only 4 weeks into veg. What do I do? Pictures attached. Let me know if you need any more information.
 

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