The fish can be as healthy as possible.If you add a fish that is untreated this can get all your fish sick.So make sure you treat every fish for ich before adding it.Even if it has no sign of disease.Some people may disagree but I have had a lot of experince with ich as my first fish was a cowfish.The best safest way is cuprimine in my opinion. As soon as I started treating my fish with it no problems.All my fish are healthy.Knock on wood.
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