The Flower Cardinalfish (Apogon maculatus) is a colorful and popular aquarium fish species belonging to the family Apogonidae. They are also known as the Spotted Cardinalfish or Polkadot Cardinalfish due to their distinctive spotted pattern. These small fish are native to the Indo-Pacific region, including the Red Sea, and are commonly found in shallow reef environments.

Flower Cardinalfish typically grow to a size of about 3 inches (7.5 cm) in length and have an overall slender and elongated body shape. They have large eyes and a pointed snout, which they use to forage for small crustaceans and other invertebrates in the crevices and reef substrate. Their body is covered in small scales, and their fins are generally rounded.

The most notable feature of the Flower Cardinalfish is their striking body coloration. They have a bright red to orange-red base color, which is covered in small white spots that can vary in size and density. They also have a black spot near the base of their tail fin, and a white stripe that runs along their dorsal fin. The coloration of these fish is thought to be an adaptation to their environment, allowing them to blend in with the reef and avoid predation.

In the wild, Flower Cardinalfish are a social species, often forming small groups or pairs. They are generally peaceful and can be kept with other small and non-aggressive fish in a well-established reef aquarium. They prefer a well-lit aquarium with plenty of hiding places, and should be fed a varied diet that includes live or frozen foods.

In the aquarium trade, Flower Cardinalfish are a popular and sought-after species due to their vibrant colors and peaceful nature. They are relatively hardy and easy to care for, making them suitable for both novice and experienced aquarium hobbyists. However, like all fish, they require proper water quality, temperature, and feeding to thrive in captivity.

In conclusion, the Flower Cardinalfish is a small, colorful, and peaceful species that is popular in the aquarium trade. Their unique spotted pattern and vibrant red coloration make them a striking addition to any reef aquarium. With proper care and attention, they can live for several years and provide enjoyment for their owners.