I don't know what is wrong if the roots look healthy. Possibly the stem has rotted so that the leaves cannot receive moisture. See if you can somehow check the stems. In any case you should be able to root leaves to save the plants. If they are limp, cut them off with a sharp knife like a single edge razor blade, then place in a bowl of water to turge up. This can take overnight. Then plant the leaves in moist media and enclose in a ziplock. One thing you can do with the parent plant if it hasn't recovered is take it as a crown cutting, cutting it off and planting in moist perlite/vermiculite or in long fiber sphagnum moss, and enclosing in a large baggie. In either case, put it under lights, as cuttings need light in order to root. Good luck, I hope my suggestions work. I have lost chiritas that were wicked from rot. One species, eburnea, seems to be one that is susceptable to this.

Jon

Maybe your potting mix is too heavy for wicking? You could add much more perlite to lighten it to see if they would do well with wicks.

Nancy