In the last day, I put a small fan on them. Checked them just now. One plant is OK. On the other the top 3 fan leaves have curled up and died.

I turned off the HPS and am going back to the fluorescent. Maybe when they are bigger I can try HPS again - they are about 1 foot high now.

Previously I grew 5 or 6 plants in this same space using HPS and had no problem. These plants are a different strain (Oasis).