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