It can be said that the silver dragonfish eat a lot of things, you can feed the cockroaches, but it is best not to catch directly at home, to buy the fish market processed, you can also feed the small fish, fish bugs and so on; as for the "cockroaches can be eaten to become a gold dragonfish" is nonsense, the gold dragonfish and the silver dragonfish is a different two kinds of fish.
To silver dragonfish grow well and good color, you can feed live shrimp, you can also feed fresh scaly fish fry. If you feed scaly fish like loach for a long time, it will cause the effect of black and dark back.