The commonly used and advised food is tropical fish flakes but if u feed it to your goby they will starve and die. The best food for dragon goby is black worms, blood worms and brine shrimp. Following this food habbit will lead them to grow upto 12 inches size.
Although these fish aren't predator's, they like to eat small, live foods. Sometimes, they will eat a sick or injured fish. They will accept frozen and pelleted and flake foods. They love to eat worms.
The dragon goby eat small live foods, but will accept frozen and/or pelleted and flake foods. they Love worms. Also they will eat the algie from the bottom of the tank as well as off the glass and the rocks in the cage. they will also eat small or injuried fish.