African Dwarf Frog Alternative Name(s): Congo frog , ADF(abrev) Scientific Name(s): Hymenochirus boetgeri Category: Freshwater Invertebrate Difficulty: Maximum Size: 7cms Minimum Tank Volume: 50 litres Minimum Tank Size: 18" Water Temperature Range: 24-26°C Water pH Range: 7.2-7.6 Water Hardness Range: 0-0 dGH