bluey, but nature has a way of filling regions that animals live in and adapt to. Some fish like plecos do better in a swift moving current. Others such as gouramis prefer still water.
If you consider a fishes anatomy and breeding habits, it should make sense. A pleco can hold on to something submerged with its mouth and has adapted to living in high current regions. A gourami builds a bubblenest on the surface and needs still water to accomplish this.
That being said, I'm sure you can reach a happy medium.