Red Cherry shrimps or RCS are a breed of shrimp known as Neocaridina denticulata sinensis. Red Cherry shrimp exist in many colors in the wild but in the aquarium red is by far the most popular strain and this is attributed to their name. The bright red color is a result of years of selective breeding. The red cherry shrimp really stands out in the aquarium especially against plants and darker substrates.(read more here: http://aquariuminfo.org/rcs.html)
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