My Angelfish has ick. She has 4 white spots on her head and a copper color on her body (mainly on her head). I also have 1 cory cat fish and a gold gourami fish in the tank who aren't doing well either. How can I treat them all in the same tank. I've read about turning the heat up, salt and copper safe. But it seems salt and copper safe isn't good for the Corys. How should I treat? I also have plants in the tank. My tank is 36 gallons with a total of 3 fish.