i'd take the rock out and try an exacto knife. i use the back edge to pluck the polyps off. then simply super glue gel them to another piece of rubble.
watch out! they squirt. where some safety goggles and gloves. i got a squirt right by my eye close call! then the next morning my hands were a little swollen and itchy. they stayed swollen for 2 days and were itchy for about a week!
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