If you want to try an experiment, perhaps put them in more flow than they like and see if they de attach to move. Just catch them before they settle. I know mushrooms in my tank have done so before.
Or, fan them to close them up and place smaller rocks around between them and see if they move onto them.
I haven't tried to move a ricordia, but there's a chance it may work as it does for shrooms. Don't really know for sure.
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