Yes, you will need to QT your corals, and any LR that you happen to buy too. You'll find a lot of people get Ich and can't figure out why, especially since they haven't added any fish in a long time, and it turns out that they've gone corals or LR from someone tank that has had Ich in their tank. As I posted in the other thread, I rinse off all my corals and scrub off the rock that they're mount on before I place them into a QT. I then change the water completely each day, which I also rinse and scrub the corals even more. This is not a full 2 month QT but it has worked very well for me.