Black Ruby Barb 3.5cm Pethia nigrofasciata

Temperature: 20 – 27 °C
pH: The farm-raised fish available in stores are fairly adaptable where water chemistry is concerned and should be happy within the range 5.5 – 7.5. Wild stock are likely to prefer slighty acidic to neutral conditions.
Hardness: 36 – 268 ppm. Wild fish will probably do best towards the lower end of this range.
Image from: SeriouslyFish.com