The treatment has no visible effects on fish, corals, worms, flatworms, snails, clams, starfish, and sea urchins. . .
Corals infested with bugs will start to show increased polyp extension during the treatment! However, it will probably kill every one of your amphipods and copepods and really mess up any crabs and shrimps. The effects on shrimp and crabs are not long lasting, 24 hours after the treament (and two partial water changes later) new crustaceans were unaffected.