Fish that handle tropical yet Coldwater temps

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Hemigrammus caudovittatus, Buenos aires tetra, same as for tanichthys albunobes and peocilia sp.
 
All Goodeid species and also few coolwater livebearer species.
 
Any of the rainbowfish. I had a pair that I had in a pond that I didn't know were in the pond made it through a Michigan winter where the pond had a pump so it wouldn't ice-over. These were Parkinsoni Rainbows.
 
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