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I never thought of Pipe Organ, I can peel it of the rock and it is soft. Not hard like Pipe Organ I have had before.What you have is a Pipe Organ Coral, that's the reason it has a Stoney base. It looks like star polyps when open but of course star polyps have a soft base.
Mine does the exact same thing. I have some high end corals but this is the coral that everyone notices and likes. I might get rid of it to save my sanity.I use to have a colony very similar to this. It would send out growths and took much longer to spread. Looks nice when opened. Congrats on the find!

