ok, have a few questions about QT. I am looking to add a powder blue tang and a surgeonfish to my tank. I have 3 tangs already in the tank showing NO signs of ich for 5 months now. They all get along great. I have a 10 gallon tank I can make into a QT tank. How long does it need to be up and running to use as a QT tank? Do I need to let it cycle or what?