Depends what you mean by naturally tropical. I don't recognise the fish in the video to be able to google them, but a good portion of the fish that are generally sold as tropical fish will do absolutely fine in a temperate aquarium in a room that doesn't get cold. I noticed there are cories in that video, and they're a prime example. Remember that most of these fish come from hotter countries nearer the equator, where their colder temperatures are still much warmer than ours, so while they're tropical by our standards, they're practically coldwater by theirs.