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Symphysodon (colloquially known as discus or discus fish) is a genus of cichlids native to the Amazon river basin in Brazil.Due to their distinctive shape, calm behavior, many bright colors and patterns, and dedicated parenting techniques, discus are popular as freshwater aquarium fish, and their aquaculture in several countries in Asia (notably Thailand) [1] is a major industry.
Symphysodon discus, the red discus or Heckel discus, is a species of cichlid endemic to the Amazon Basin of Brazil, where found in the lower Rio Negro, upper Uatumã, Nhamundá, Trombetas and Abacaxis. [2] This species is essentially restricted to blackwater habitats with a high temperature of 26–32 °C (79–90 °F) and low pH of 4.2–5.2. [3]
The taxonomy is disputed, but FishBase follows a review of the genus from 2006. [2] [8]In 2007 it was suggested that the correct scientific name of the blue/brown discus is S. haraldi, whereas S. aequifasciatus is the correct name for the green discus.
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The bleeding heart tetra is distinguished by the small red spot on both sides of the fish. This fish is very prone to diseases, and can grow larger than most tetra species. [30] Bloodfin tetra: Aphyocharax anisitsi: 5 cm (2.0 in) Blue tetra: Knodus borki: 5 cm (2.0 in) Blueberry tetra: Hyphessobrycon wadai: 3.5 cm (1.4 in) Brittanichthys axelrodi
A hybrid fish called a "red Texas cichlid" The Texas cichlid is commonly found in the aquarium trade and became relatively popular in the 1980s with cichlid enthusiasts because of its iridescent blue and green markings.