Black devils like to eat live animal bait, such as water worms, red worms, etc., but black devils are also very easy to accept all kinds of artificial bait. The black devil is mild-mannered and can be mixed with most tropical fish. But the black devil will eat the little black devil, so special attention should be paid to it. The black devil's eyes have degenerated, he can barely see anything, and can only sense light and dark, but his body emits weak radio waves similar to radar functions, and relies on it to see the surrounding environment.

Feeding the black devil food must follow the four rules of timing, fixed point, qualitative and quantitative in principle. The specific feeding time should also be appropriately increased or decreased according to the season, climate characteristics, water temperature, water quality, and feeding intensity of the black devil. Do not cast more or less at will, not cast for a few days, or cast together for a few days. If you can't feed the black devil every day when you go out, just feed and change the water as normal before going out to ensure that the water quality is clear and the oxygen is sufficient. The short-term hunger has no effect on the health of the black devil. They were fed into the fish tank together and caused the death of the black devil.