Black-line flying foxes are not strict with food requirements, they can eat fish food, algae feed and cucumber slices, and generally eat algae feed.

Although black-lined flying foxes are not picky eaters, it is not advisable to overfeed them, as this may cause black-lined flying foxes to become lazy and prefer to eat thin fish food rather than algae. If the aquarium is severely attacked by black hair algae, it is necessary to reduce the feeding as much as possible to encourage the black line flying fox to eat black hair algae.