Gouramis

[BlackEndler]

In a reasonable climate with a heater would they be okay

 

[Colisa lalia]

Try to keep the temp in the pond above 70F, other than that they should be okay.

 

[Doggfather]

How deep is the pond? If it's too shallow certain species of bird swoop and try catch some fish for dinner also, tank mates are a factor as well as reducing temperature fluctuations