Is it usually a really good chance that a fish being attacked by parasites is a weak one or highly stressed something of that nature?? My oscar keeps coming down with gill flukes and neither of the fish in there with him come down with it. I have treated him, he did fine. I put him back in the home tank and he came back down with them again. I put him in a quarantine for 2 weeks the first week adding salt and maracide on days 1 3 and 5, on days 2 4 6 and everyother day after that doing 25% water changes. He does fine and then I put him back in the main tank and he is right back to having them again. Its obvious they are in my main tank but my other fish in there aren't being infected. Why is this so and I do not want to treat that tank for them. If I have to I guess I just have too but I'd much rather not.
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