Your quandary is the exact reason there are all these "reef safe" products on the market - but since there is no oversight to the aquarium tonic market, products are sold all the time that simply do not work. None of the ingredients in these products show up in veterinary or public aquarium treatment texts....that tells us something right there.
@LeftyReefer is giving you the solution. It isn't easy, and you may still lose fish, but hunting and pecking for reef safe treatments always fails when there is active disease.....
Jay