The ones in my pics are Geophagus iporuguensus, a more southern variant from the braziliensus complex.
I had the normal G braziliensus,(like RD) before I had digital cameras.
Always like this pic of the pair defending territory against the much larger Madagascan Paratilapia.

other southern South Americans that don't require large tanks, or heaters

are Gymnogeophagus, Australoheros and even some pike cichlids

Gymogeophagus yerbalito above, paso Pache below

Australoheros red cabal below

normal color above, breeding color below

and a shot of my Uruguayan (cool) water cichlid community below
