It'd be illegal to stock them in GA and all would not survive all but the mildest of winters.

Also keep in mind, most require very special spawning conditions, unlikely to be found in a typical American pond. They're native habitat involves giant swings in precipitation amounts and flooding.

Generally, if a species isn't already successfully introduced into Florida, it is likely not a likely candidate. There are many tropical fish farms in Florida that have flooded or aquarium releases. If any of these species could reproduce and compete in the wild, they'd already be found as exotics in Florida. Native gambusia are very aggressive and are actually a major cause of the decline of many native fish declines in Australia where they've been introduced.

There are many native alternate forage fish options out there. For example, research taillight shiner. And the US has native sailfin mollies and several killifish and topminnow species... These species are adapted to the southern US.