South American Cichlids range in size and types from fish like Discus, Angelfish and Dwarf Cichlids to the Larger Cichlids such as Green terrors, Oscars and severums.
Most of these fish require a lower ph of around 6-7 and blackwater which is normally tanned orange from natural sources such as peat, bogwood, and aldercones.
For information on discus, angelfish and more dwarf cichlids see the relevent care sheet.