I have not paul. It came up on a piece of rock at the top of my display. It was in pretty decent current. It looks so much like an anemone, i thought thats what it was until it didn't react to touch. After it had grown to about the size of a golfball, it came unattached. I found it under a rock about a week later, and attached it to a rock with super glue gel. Its been sitting in my sump with minimal flow every since, lighted with a 65k spiral fluoro 24/7. It seems to be growing nicely. It has quadrupled in size in about six months i'd say. I will get a pic of it and post if you wish.
Can you prune this like any other macro? What is the rarity of it?