I don't QT LR, and depending on the type of Coral yes I might QT.. Other I do a Lugols dip on and put right into the display. But there are several factors that go with that. Where I got it from, if it was on a central filtration unit.. etc etc etc. I also go over my corals with a fine tooth comb before ever putting them into my display as there are all kinds of other parasites that could be fine on one coral but not another.