Here are some more pics. I could only upload 5 in the first post.

Hope these help.

BTW the 2 plants that look like death, only seem to be affected in the leaves. The stem of the plant is very strong, and the leaves emerging from the nodes do not seem to be affected.

Pics:
Pic#6: Better view of the browning turning white/dead
Pic#7: Tips of one of the healthier plants dying
Pic#8 & 9: One of the ones that I dont think can be saved. (What is happening here?!)
Pic#10: This one is very healthy looking, except for the strange white spots. I thought it might be salt buildup, but it doesnt wipe off.