I got this at the locale fish store they could not think of the name its like a live rock the polyps go inside the rock when closed . If this is posted in the wrong area please move or let me know I would love to know what it is !
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I have one of them I don't think its the same it is a deep purple color and when the polyps retract it looks like just like a bare rock ! At first I thought star polyp but there's no mat .Probably Clavularia, like below. Not my image.
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