Leaf edge curl up is usually attributed to humidity and heat issues.
explain a little more about how you are growing them?
light?
Temps?
RH?
pH?
Medium?
Medium?
Feeding routine?
Air movement?
Intake and exhaust?
Everything you can list please do so.
yes your other plant looks a fair bit green and starting to look waxy/shiny.
your medium looks like coco? Or is it a high grade of soil?
Please let us all know as much as you can.