Quick Stats Minimum Tank Size: 20 Gallons (76 Liters) Care Level: Moderately Difficult Water Conditions: 5.5-7.0 pH and Soft to Moderately Hard Water Temperature: 75-84 °F (24-29 °C) Maximum Size: 1.5 inches (3.5 cm) The black-winged hatchetfish (Carnegiella marthae) is a small, peaceful freshwater fish, noted for its unusual body shape. Its laterally compressed … [Read more...] about Black-winged Hatchetfish – The Care, Feeding and Breeding of Black-winged Hatchetfish