Pygmy Cory Alternative Name(s): Scientific Name(s): Corydoras pygmaeus Category: Tropical Difficulty: Maximum Size: 3cms Minimum Tank Volume: 45 litres Minimum Tank Size: 18" x 12" x 12" Water Temperature Range: 22-28°C Water pH Range: 6.4-7.4 Water Hardness Range: 2-15 dGH