If I remember correctly Wonder tonic contains methylene blue,acriflavine, malachite green and quinine. The latter two are pretty effective against white spot but I am not sure about the dose rates. I don't think your clowns will like too much malachite and they may have cut back on that because of sensitivety by some fish. I agree with the previous comment about raising the temperature. My understanding is that the temperature is raised to speed up the life cycle with white spot and velvet (which can have an encapsulated form) because it encourages the vegetative state where the parasite is susceptable to the meds, not that it will kill the parasite.