The Melon barb, Barbus fasciatus is a sturdy, easy to keep easy to feed, and pretty easy to breed species. Peacfeful enough, but as with all species, when there is a large size difference, a perfectly peaceful fish may regard a small fish simply as food, it is not aggressive behaviour. As this fish grows to 150+mm/6" I'd be somewhat concerned for the Neons. Also, as a shoaling fish which should be kept in a group of 5-6 or more specimens, you'll need to consider you tank space and stocking level.