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Guppys in outdoor pond NO heater?

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mine died off over last winter. If you value them I wouldn't do it. Maybe just try a few and see how it goes. I just restock with a few from my daughters tank and now they're everywhere again

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Deeper ponds dont fluctuate in daily temperature as much as large volume ponds which dont fluctuate as much as shallow or small ponds.

At the start and end of brisbane winter, day temperature can be 30 degrees and night temperature can be 10 degrees. A 20 degree rapid change is hard for all fish,  cold water, cool water ir tropical.

I have salmon tail catfish outdoors. I use a heater set to 18 degrees at start and end of winter to stop the fluctuations and turn heater off once the weather settles. 

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