Well if you didn't know, Xenia and GSP can sting and release small amount of toxins to fight against other corals. That happen to my White pompom xenia colony a while back and my yellow figi leather fought back and release some of it's stuff. I had to suck it all out quick, lucky I caught it in the act or some other stuff will fight. I was fixing to chant "FIght Fight Fight,", jk, lol

-Joseph