Polypterus

Polypterus, commonly known as bichirs, are an ancient group of freshwater fish native to the Nile River, Congo River, Lake Chad, and other African water bodies. Virtually unchanged for over 100 million years, they are considered living fossils. Their elongated, rope-like body is covered in hard rhomboid ganoid scales, and a series of small finlets (polypterus means 'many fins') run along the dorsal surface. Size varies greatly by species, from about 30 cm in smaller species to over 80 cm in the largest. Bichirs possess primitive lungs — modified swim bladders — enabling air breathing at the water surface, an adaptation to oxygen-poor environments. Nocturnal and bottom-dwelling, they move in a sinuous crawling motion and are strictly carnivorous, consuming frozen bloodworms, feeder fish, carnivore pellets, and shrimp. Their predatory nature requires careful tankmate selection — any fish small enough to fit in their mouths will be eaten. Water conditions are relatively flexible (pH 6.5–7.5, 25–28°C). Remarkably, they can briefly move on land using their pectoral fins, making a tightly fitting lid essential to prevent escape.

Source: Wikipedia (CC BY-SA 4.0)

Frozen bloodworms, shrimp, small fish, pellets