Heres a few pics of some clones that were cut from a few different plants that had similar symptoms. Mind you the parent plants are thriving now and clones still sick. If you can tell in the pictures there is root growth in the cubes even with how sick they look. It can't be temperature, humidity or water because as you can see the nice pretty plant is right next to these clones. I've never had this happen to me so it would be great to figure out whats going on. The leaves yellowing with green veins. Then as you can see the end result is curled up dryed leaves.