The chalk bass (Serranus tortugarum) is a small, vibrant, and hardy marine fish native to the Western Atlantic and the Caribbean Sea. Known for its peaceful nature and ease of care, it is a popular choice for beginner and experienced aquarists in the saltwater hobby. 

The chalk bass is a small fish, typically growing to a maximum size of 3 to 4 inches (7.5 to 10 cm). Its body coloration is variable and can change to help it camouflage with its environment. The typical appearance features an orange or pale blue-grey to pinkish-brown body, highlighted by eight narrow, vertical electric blue or dark stripes along its upper body and a purple mid-section. Its fins are usually transparent to pinkish in color. 

In the wild, the chalk bass is found in the tropical waters of the Western Atlantic, ranging from southern Florida and the Bahamas throughout the Caribbean. It inhabits coral reefs, rocky crevices, and sandy or rubble bottoms at depths between 6 and 1,300 feet (2 to 400 meters), though it is typically found at depths less than 300 feet (90 meters). They often hover in loose aggregations near the substrate and dart into nearby cover, such as abandoned conch shells or rock formations, when threatened. 

The chalk bass is a carnivore, primarily feeding on zooplankton in its natural habitat. In a home aquarium, it is a voracious and non-picky eater that will readily accept a variety of meaty foods. A varied diet of high-quality marine pellets, flakes, and frozen or live foods such as mysis shrimp, brine shrimp, and chopped seafood (clam, scallop, krill) is recommended. They are known to be enthusiastic eaters and are prone to obesity if overfed. 

The chalk bass is a hardy fish that is well-suited for a marine aquarium, making it ideal for beginners. A minimum tank size of 30 gallons is recommended. They are generally peaceful and will not harm corals, making them an excellent reef-safe addition. However, they may prey on very small ornamental shrimp, such as anemone shrimp, once they reach adult size. 

Chalk bass are social and thrive in groups, which helps them feel more secure and less timid. If keeping multiples, it is important to introduce the entire group to the aquarium at the same time to establish a hierarchy and avoid aggression. The aquarium should have plenty of live rock and hiding places to mimic their natural environment. They are known to be jumpers, so a secure lid or cover is essential.