Almost overnight my lovely pepper plants turned yellow. Some of the leaves are showing purple veins and stains. I don't think it's over-watering. I took all of them out of their pots yesterday and they have beautiful root systems. I have the plants under lights for 16-18 hours in the basement. I use promix for my starter and potting up. I am giving them diluted neptunes harvest once a week. Do they need more nutrition? Are they too cool? I have not had this problem in previous years.

Help!

Keski