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While it may be that oscars survive in brackish water, they never encounter that in their native habitat, unlike Poecilieds like "mollies" that live in coastal areas and can (fairly) rapidly adapt to changes in salinity. I believe that it would be stressful to the oscar's physiology to keep them...

I was referring to the original post, under the brackish section.

Oscars are not brackish water fish! I would be very hesitant to recommend them for anyone who is not planning a dedicated freshwater tank for them. They are a disaster in most community tanks, either eating everything or dying quickly from the persecution of larger fish. And please, never keep...