There's not much out there. They're believed to be non-guarding egg scatterers. If you are having trouble feeding him, I recommend trying frozen bloodworms or brine shrimp. I'm not sure if these fish should be kept in groups or not...also, make sure your water quality is up to par, that is, no ammonia, nitrites, and low nitrate readings for these open water fish.
Charax gibbosus (Linnaeus, 1758)
Family: Characidae (Characins), subfamily: Characinae
Point map Order: Characiformes (characins)
Class: Actinopterygii (ray-finned fishes)
FishBase name: Glass headstander
Max. size: 12.5 cm (4.5-5")
Environment: benthopelagic; freshwater; pH range: 6 ? 7.5; dH range: 25 Climate: tropical; 24 ? 27°C
Importance: aquarium: commercial
Resilience: High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.)
Distribution: Gazetteer South America: Essequibo River basin and coastal rivers of Surinam.
Biology: Found in lentic environment (Ref. 11229).
