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I think that’s just purple “painted” rock.A purple mat like that is likely Green Star Polyps (GSP) but it doesn't look happy/healthy. Is it alive? Usually you'll see little green "lashes" on stalks all over that mat like a see of grass:
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Ahhh... I'm on my phone and couldn't even see that.I think that’s just purple “painted” rock.
I think OP is referring to that dark anemone

No worries, I thought the same on my phone so I couldn’t answer initially, until the first comment appeared and I zoomed in and thought “oh yea, there’s something there”Ahhh... I'm on my phone and couldn't even see that.I think that’s just purple “painted” rock.
I think OP is referring to that dark anemone![]()
A better picture will really help, maybe you can move that purple rock out of the way for the picture
No worries, I thought the same on my phone so I couldn’t answer initially, until the first comment appeared and I zoomed in and thought “oh yea, there’s something there”