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Looks like a Barnacle to me. Or a button polyp that is closed
that's a closed button polyp
protopalythoa aka button polyp
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[URL=http://www.3reef.com/gallery/photos/what-is-this.5637/]What is this?[/URL] by [URL=http://www.3reef.com/gallery/authors/tbone.24865/]Tbone[/URL] on 3reef Aquarium Forums
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