I have a 75 gallon fish only tank 0ne firefish, 2 clowns, one diamond watchman gobie, one female lyrtail anthias, one hippo tang, red leg crabs and snails. Water quality is good. Tank is 7 weeks old. I treated for flukes 3 days ago prazipro. Hippo has ich. I have no qt tank. I've read Hyposalinity is a good treatment. But how slow do I lower Salinity. I've read to bring it down to 1.009 im at 1.024. All suggestions and experiences accepted please and thank you. All fish are a active and eating good especially hippo he's a lunatic and a pig.