Hecqs Shell Fish. Get Price Quote. Scientific name: Neolamprologus hecqui Common name: Hecq’s shell-dweller Family: Cichlidae Usual size in fish tanks: 8 - 9 cm (3.15 - 3.54 inch) 0 14 Recommended pH range for the species: 7 - 8.4 Recommended water hardness (dGH): 8 - 28°N (142.86 - 500ppm) 0°C 32°F 30°C more View Mobile Send Inquiry ...