Hello everybody,\n \nI have my 120 gallon DT, in it 50 pounds of live rock, 1 diamond watchman gobby, 1 bi-color blennie, 2 firefish, 2 clownfish, 3 snail, 2 cleaner shrimp, 5 hermit crabs, 1 green bubble tip anemone. In my 10 Gallon QT tank I have 1 blue tang, 1 yellow tang. Well I noticed that my blue tang and yellow tang had some with spot on it and I had ich before, but when I had freshwater fish. I went and put the blue and the yellow tang in the QT treated them and this tuesday was the last day they showed signs of ich, I waited tyl sunday to put them back in the DT. But later on that night they had it again?. My fish in the DT do not show any symptoms of ich. what should I do?