11-09-2011, 06:57 AM
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In my expierience, some do, some don't.
Fish that do adapt can do well but may not breed successfully, (ie) eggs don't hatch ,eggs are eaten,low numbers of eggs and or survival rates of resulting fry.(hard water can affect egg fertilization,embryo development)
Those fish that don't adapt are often sickly most of the time. Fin rot,fungus,ICH,bacterial infections are common, and fishes seldom last longer than a few day's,week's, month's.
These symptom's are also common with poorly maintained aquariums as well.