Common, early in a re-veg. I'm guessing the plant is simply going..."WTF?"
Will re-pot it tomorrow in a 3 gallon and see if it will still fit in my veg room.

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Horticultural Myths and Folklore
Fox Farms Feeding Schedule
Dealing With Heat Issues in the Desert
Rusty's Bonsai Re-Vegging
CanCom Troubleshooting Forms