Well saturay i noticed one of my fish had ich. So i went and for copper and a test. I did a 25% water change of my 180 gallon tank and then added the copper. I already have aquarium salt in the tank but i added extra. Then yesterday i did the second dose of copper. I was told it would get worst befor it got better and that i wouldnt see any results.until the day after the second dose. So that will be this evening and all i can do is hope it wotks. I had 15 fish and now I'm down to 8. This is so sad to me. What can i do in the future to prevent this? I don't have a quatantine tank