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I would have to say down to about 60 degrees.Down into the high 50's and death could occur.I had a few reds die once when my heater gave out and the water temp got down to 56 degrees.Ternetzi's can actually go into the 50's because of their southern range.The South American winters get a hair colder down there so they are used to the cooler water to a degree.
 
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