| Have you looked at the ingredients on the bottle. I personally don't trust these poisons even at low levels supposevley safe for our inverts and corals. I also wouldn't worry too much right now, you most likely had ick in your tank before the fish was introduced to your tank. I believe that it was your stressed fish that attracted the dorment parasite. I have used Rally which is made by the same company "Ruby Reef" to rid my tank of flukes. It didn't work and seemed to kill off my biological filtration and coraline algae. I would look for other ways to help control the outbreak. | 
