251738
The term is most frequently used to describe small South America n or West Africa n species which are suitable for soft , acidic ( pH 4-7 ) densely planted aquariums , however , some aquarists and authors include within this " dwarf cichlid group " a variety of small-sized cichlids from the African rift lake s. Dwarf cichlids prefer aquaria with plenty of hard-leafed plants .
 South America
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 South America