What is this And is it that bad?



This purple stuff has hitchhiked in and has now began growing on most of my beautiful live rock... It's a purple brown color and is like a carpet... When the lights are off it closes up and looks like some form of Xenia or polyp that almost looks black. When open it looks like star polyp but super small.

HELPPP

CAN I KILL IT OR IS IT NOT BAD
 
Sansibia? If it is, it will spread but won't overgrow any stony corals.

yeah it really doesn't overgrow anything... i'm just getting annoyed by it.... is it bad or should i be happy its not something totally terrible.... this is about the only pest i've ever gotten......
 
Actually looked close at the tank tonight and it seems to be messing with some zoa colonies. :( might be time to rip the tank down and start over. I have so much bad *** coral though what do I do. I don't wanna junk it all or spread this stuff locally to other guys or my new tank
 
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