Looks like something is munching... bush snails come to mind, since they are too small to take full bites, they go after the first few layers of tissue on the surface. The fact that you have other nearby plants with the same symptoms, I'm going to suggest repotting, cleaning the old medium off as well as possible - on the Cyms as well as the Dens, and straight to the trash can for the old medium. If not bush snails, something that behaves similarly. Fresh medium should do the trick.
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