Family: Characidae Distribution: The north-eastern area of South America – Guyana – is where Hemigrammus gracilis makes its home; specifically, the São Francisco and Amazon River basins and adjoining tributaries. PH: 5.7 – 7.5 pH Temperature: 24 – 28 °C (75 – 82°F) Hardness: 4 – 15 dH Description: Like the rest of the Hemigrammus [...]