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I had some purple stuff that grows on the same rock I don't know what you call it died as well have any idea why?It's not dead. Trust me, You are not that lucky. If it's not dead I highly suggest pulling the rock out and torching it off. Later on down the line you will wish you did.
It's not coralline it look like little flowers. The Pom Pom I smelled it and it smelled rotten so I know it was dyingpurple coralline is questionable. not sure what causes it to die. It doesn't do well in my tank either. I have pom pom/pulsing zania. At one time I had a lot then all the sudden it all started dying, some lived and is now out of control. My water has always been good and im able to keep most corals. A good example is....Me and a friend share salt water and r/o water we have the same exact water conditions. zania wont live in his tank but will live in mine. It may come back to life it may not. zania is funny like that. personally Id say get rid of it. check your alk and calcium levels for the coralline.