Texas cichlid Alternative Name(s): Rio Grande Perch Scientific Name(s): Herichthys cyanoguttatus, Cichlasoma cyanoguttatus Category: Cichlid Difficulty: Maximum Size: 30cms Minimum Tank Volume: 260 litres Minimum Tank Size: 48" x 18" x 18" for 1 Water Temperature Range: 20-28°C Water pH Range: 6.0-7.5 Water Hardness Range: 5-12 dGH