Hi people, got time? Need yr advice on two things: a colony of xenia is growing wild. Tried using knife to remove as much as possible but it grows back in no time. Does anyone know a more efficient method? It grows on rock with a v nice mushroom, otherwise I would have simply thrown it away. Second problem: some of my zoas are losing colour (mainly green, purple and luminous hues). Other corals doing fine. Any clue? Appreciate yr time!