You can use hemostats and grab the um trunk/foot thing and gently roll it to one side. You should be able to remove the whole thing if you don't want them to grow back on the rock. IF you do want them to grow back then you can just cut them off under the cap as was said, let the cap settle on some coarse gravel for a few days then you can pick it up again and glue the new foot onto a bit of rubble, it's a good way to get more. If you do want to grow even more, once they are growing back nicely, you can cut them in half with a razor blade where they are, they will divide and reform in a few weeks.
Doug
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