I only QT my fish, but in all honesty, anything that may potentially have something you don't want getting into your tank, should be QTed, including fish, corals, inverts, snails, clams, ect. ect. ect. probably not pods, but then that would depend on the source of the pods. If you got them from a fellow reefer, best to QT unless you personally know the system and trust the system.