The Colombian red and blue tetra (Hyphessobrycon columbianus) is a small fish that appears to only be known from the Río Acandí in Chocó Department, northern Colombia, close to the border with Panama.  This fish grows to an adult size of 2 to 2.5 inches long.  Sexually mature males are noticeably more intensely colored with slimmer bodies, are slightly smaller, and develop a more extended dorsal fin than females.
                                             
Colombian red and blue tetras should be maintained in an aquarium of 30 gallons or larger.  A soft, sandy substrate (CS7538) is a good choice.  Driftwood (ZM2000) and live or artificial plants may also be incorporated.  Filtration does not need to particularly strong, but some water current is appreciated.
                                             
Colombian red and blue tetras prefer a temperature of 68°F to 82°F, a pH of 5.0 to 7.5, a hardness of 1 to 10°H.  Be sure water is clean and well oxygenated.  
                                             
Colombian red and blue tetras are generally relatively peaceful.  They are best maintained with other similarly sized tetras, smaller catfishes, and small to medium non predatory cichlids.  Rams, apistogrammas, and angelfish may all make good choices.

Colombian red and blue tetras are a schooling fish and should ideally be maintained in a group of 8 to 10 individuals of mixed sexes.
                                        
                                      
Colombian red and blue tetras are very easy to feed in the aquarium.  They will readily accept flakes (AL165), micro pellets, and frozen (SF6777) or freeze dried foods.  For maximum color, growth, and health these fish will look their best when given probiotics (AL169) in addition to a balanced diet.