Stalsbergi, are from rivers, but stay in quiet pools most of the time.
Rivulatus are know to be collected in many different habitats, from quiet pools to fast flowing areas
I have Panamanian GTs, Andinoacara coeruleopunctatus, and were collected in the area of the video below, so I am using a fairly strong current in the tank., and they don't seem to mind.
The video is not mine, but a promo for the area. Proyecto Inmobiliario River Village Panama