There are a lot of different ways. You can cut it off at the base and glue it to a different piece of rock with super glue. Or you can cut it at the base again and then cut it into small slices like a pizza and glue them the same way. They will all grow into new heads. I have heard of people putting the cuttings into a blender and then dumping the water into the tank. But I don't know how well that works.