Hello!
Does anybody know what kind of coral is highlighted in this image?
EDIT: It's growing directly on the live rock; a tiny little carpet. Purple base, green polyps.
GSP.
Isolate the rock if you don't want it to overtake the tank. It can spread fast and can survive through many hard condition. It'll even grow on the sand and glass. Anything that is hard, it can attach to and spread like wildfire.