The long-nosed unicorn mainly feeds on algae, and can also be fed animal bait, but providing enough plant-based food such as seaweed and seaweed can enhance the body's immunity of the long-nosed unicorn, reduce aggressive behavior and improve its overall health. Dried seagrass can also be tied to the stone for feeding, and it is recommended to feed 3 times a day.

Long-nose unicornsThe fish is bluish-gray as a whole, and the ventral part of the fish is pale yellow. The dorsal and anal fins of the long-nosed unicornus have many dark horizontal lines and are blue-edged. The body color of the juvenile-nose unicorn is a little different from that of the growing-nose unicorn. The general body color of the juvenile unicorn is taupe. Long-beaked horns live mostly in waterways, lagoons, and coastal reef areas, and they generally eat zooplankton.