I don't QT, in a separate QT system. However, I do dip all additions. If it's an SPS, I add CoralRx to the bag that the coral is in, close the bag up and shake it up really well. Then I let it sit for about 10 minutes. While doing this, I mix up a small amount of water, from the display tank, and add Interceptor. Once the 10 minute CoralRx bath is done, I move the coral to the Interceptor bath, for about 25 minutes. During these treatments, I also inspect the coral, very closely, with a magnifying glass. After both treatments, I place the coral in the display tank, on a frag rack, near the glass. THEN, I take a clear Macro photo of the coral, from different angles, making sure I can inspect all of the photos well. I upload the photos to my computer, zoom in on the photos and inspect the photos very well, for any possible problems.