Although they are omnivorous fish, they do not choose food, but they also prefer live animal feeds. The principle of polyculture must be paid attention to when raising craterfish. Because craterfish prefer animal feed, they have the nature of chasing small fish. Craterus is a fish in the lower waters, with a strong body. It rampages in the aquarium, attacks other fish, and devours small fish. , it should not be mixed with other fish.

The calamus is a large and colorful tropical fish with a large food intake and likes neutrality Water, the suitable temperature is 20-30 degrees Celsius, and the aquarium should be large. The calamus does not have strict water quality requirements, and can live in the water temperature of 20-30 degrees, and the optimum growth temperature is 23-25 degrees. Not choosing food, but love to eat animal bait.

The craterfish is larger, spindle-shaped, up to 10 to 15 cm long, with a large head, slightly taller and slightly flatter body, and is fat and strong. The biggest feature is that it opens its mouth wide, with a mouthful of blood red, hence the name Hukou fish. Firemouth, also known as three-dimensional fish, red-breasted perch, is native to Mexico and Guatemala in Central America.