The Yellow Tail Cardinalfish (Apogon sp.) occurs in the Indo-Pacific Ocean, typically in the Philippines. They have a silver or brown body with a yellow caudal fin. They are found in small schools among reefs or rocky outcroppings, where they hide from predators and search for small crustaceans, which make up their diet. They should be housed in an aquarium with at least 20 gallons with plenty of live rock for them to hide among. They require carnivorous preparations, usually mysis or krill, and should not be kept with larger predatory fish.