About two to three weeks ago I added some frags,(Zoas, Mushrooms,Kenya tree). Everything was looking good, then three days ago the Xenia, which has been there for years looked like it was hit with weed killer and some of the Zoas closed, mushrooms an Toadstool are OK . Only thing I can think of is it might have something to do with the placement of the Kenya tree coral which was close to the Xenia and about 4in from one of the Zoas. I moved the Kenya tree (Which looks fine) to the other side of tank. I know corals can sting but do any release toxins???? because even stuff that wasn't near the Kenya tree, was looking a little off.