I'm new here, so I hope I'm not doing anything wrong by asking this here, but I'm in need of some help. I'm growing several different varieties. Three of the varieties are not doing well. It seems like the veins in the leaves are bursting causing the leaves to go soft in large dark patches. The plants are 5 weeks old, and are rather large for their age (7 inches tall, several leaves, and some have even put out buds which I've been picking off). Could this be caused by excess heat, water, nutrients, etc. I've looked at over 1000 images of fungus and bacteria, along with other leaf issues, and have not found one that is similar at all.