Nah, no QT necessary for live rock. That’s what the cycle is for, observing and watching all of the cool things find their way around the tank. Whether it’s good or bad, I like to witness all of the things that come with live rock, that’s part of the fun. Nearly 40 years of doing this and there’s always something new to find. To me, this is the best part of reefing. I’ve seen countless threads where people are ready to take a flamethrower over nothing, when they could’ve just used a little common sense and patience to deal with the issue. Still, one of my favorite things is to look at the tank at night, it’s really fascinating how much stuff/life exists in our tanks. I enjoy this part of it just as much as watching corals and animals grow. The animals and life that come with live rock are just as important as the beneficial bacteria. In fact, it’s the “other” life that’s truly important, sponges, tunicates, worms, pods, etc I wouldn’t have it any other way.