Your area should grow 4 plants at best. The height isn't enough. Mine were in a 62" high grow box and I had to raise the top another 22" because at 5 weeks the 400w HPS was burning my taller plants. Now is thre time before you start. I think that the 400w HPS is too much for your grow box...
get a microscope and when the trichones are around 40% brownish orange harvest for a ass kicking speedy high. I will wait till around 60% brownish orange for a more relaxed high.
I vegged under 6500K CFLs for 4 wks and flowering under 400w hps in a 2x4 grow box lined w/ tin foil and my plants sexed in 5-6 days. Are you using 2700K cfls?
My girls are 6 wks flowering and look worse than yours. I over fert. mine 2 weeks back. I flushed and the leaves dried up and the buds are still getting largeer,
I havw 4 girls just over 5 wks flowering and they arre doing the same as yoursare. It's not the fan leaves but the small leave coming out at the buds. I flushed with water but they are getting worse. If you find the problem please post.
After 5 wks of flowering my girls show signs of something ......Yelow spots and edges onleaves near buds. Please help me understand if anything is wrong and what to do about it.