So I recently found Zoa eating Nudis in my BC. I took out all of my Zoas, dipped and put in coral QT tank. I did this on Saturday. My Zoas haven't been opening at all and today I noticed brown stuff on the tips. I"m a bit worried and would like to know what the stuff is. Also any suggestions on what I could add to the QT tank for maybe better luck? I'm not really dosing with anything it is just for corals.