The Threadfin Cardinal is also commonly known as the Glass Cardinal and the Longspine cardinal. In appearance, the Threadfin Cardinal is translucent and silver, but will reflect brilliant colors. The Threadfin Cardinal is very hardy, and therefore it is easily kept by beginners and experts alike. As a schooling fish, many Threadfin Cardinals can be kept together peacefully as long as they are intrduced into the aquarium as the same time. The Threadfin Cardinal has been known to be nocturnal, and may stay near shaded areas of the tank until they become acclimated to the brighter lights. The diet of the Threadfin Cardinal should include small meaty variations, as they normally eat small fish and crustaceans in the wild.