There are many kinds of food that the blue-mouthed hanging can eat, mainly macroalgae, silk algae and single-celled algae attached to the gravel. Such as zooplankton, algae, small fish and shrimp, etc., are edible for the blue-billed crane.

When raising the blue-mouthed hanging, you should also pay attention to its environment, the blue-mouthed hanging Inhabits waters between 2-30 m deep in clear lagoons and sea-facing coral reef areas, usually singly or in small groups. The adult fish is creamy yellow with about 20 orange horizontal stripes on the sides. The head has small yellow spots, and the muzzle and chest and abdomen are blue, hence the name blue-billed hanging. The body fins are blue or light-colored transparent, and the dorsal and anal fins have blue edges.