Hi,
One option would be to try to cut/scape it off at the base/rock as close as possible trying to take a little rock with it. I have moved leathers and capnella that self propagated to adjacent rocks where I didn't want them in that manner. Then reattach it to a smaller rock you can place wherever you want. Whether it regrows or not depends on how hardy it is and how much base is left as well as water quality. I haven't worked with that particular species, but I have had similar types regrow from very small cuttings, but I've also had bases just die back when I removed as much of the piece as I could.