Why is ick not going away on my fish?

Yesterday I woke up and my fish had ick. I went to the petstore and got ick treatment. I changed half of the water before i put it in. I turned the filters off because many people told me too. And when I woke up today they had more white spots on them. My Green terror has it the most. Will it go away by tomorrow or are they going to all die?
 
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