The rest of the species in that tank have been together for awhile and I have no problems.
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I already have 2 large airstones in the tank. Upping the temp won't hurt the other fish will it? I have an upside down catfish, glass catfish, knife fish, gourami, Cory cats, rope fish in the tank as well. I will add salt today as well in both my tanks.
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I really just need to get him isolated and treat him alone.
After exposing that tank to a fish with ich, treating him alone in a separate tank is a bad idea, you'll want to treat every tank he was in to make sure there isn't any of those parasites leftover.