Pinecone fish have a bioluminescent organ under their eye that they use to signal one another. To thrive they need a tall aquarium with subdued lighting and tranquil tankmates. They eat live fishes and shrimp at first and can be trained to eat prepared foods. Rarely seen, but non the less very impressive, they are well worth the effort. Their care is similar to Pinecone Fish and tend to be a little more tolerant of light and tankmates.
Cardinal fishes are in many respects the damsel fishes of the night.
Members of the family Apogonidae, they fill many of the ecological niches that are filled by the damsels during daylight on the reef. They do well in small groups and are non aggressive. They eat a variety of food and will adapt readily to captivity if they are not harassed by other fishes. There over 170 species but only a few are seen in the hobby. Sphaeramia nematoptera is the common clown cardinal.