I'd just like to inquire if a couple of corydoras catfish would be able to survive in a small outdoor pond. I live in the tropics, so winters are not something I have to worry about. Thanks
different species can handle different temps. you'd have to compare your water temps to the species. it can get too hot as well as too cold.
depth is a consideration too, it's my understanding that they prefer water shallower than 2' (60cm). my cory tank is that deep and none of the 6 species I have seem to be bothered by it.