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Datasheet
| Minimum Tank Size | 300 litres / 79.25 US gallons |
| Maximum Size | 12.0cm / 4.72inches |
| Reef Compatible | Always reef safe |
| Temperament | Peaceful |
| Temperature | 22.2°C / 71.96°F - 25.6°C / 78.08°F |
| Specific Gravity | 1.020-1.025 |
| Carbonate Hardness | 8-12 |
| pH | 8.1-8.4 |
General Description:The Black-axil chromis (Chromis atripectoralis) is a peaceful fish belonging to the Pomacentridae family. These fish are commonly found in large shoals in fish stores, but may stop shoaling once sexually mature. They are known for their attractive shiny blue and green coloration, making them a visually appealing addition to marine aquariums.
Aquarium Suitability:Suitable for most aquariums, the Black-axil chromis is best kept in pairs or in a shoal, ideally with a ratio of 1 male to 5 or more females. It is important to note that they can exhibit aggression towards each other, especially when mature. Therefore, larger shoals can help distribute aggression among individuals and increase the chances of harmony.
Demands, Care, and Hardiness:With an average hardiness level, these fish require frequent feedings, especially when newly introduced. They prefer hiding among stony corals, such as Acropora, and will thrive in aquariums with ample hiding spots. Black-axil chromis are sensitive during transportation and acclimatization, necessitating careful handling during these processes.
Reef Suitability:Always reef safe, the Black-axil chromis is a suitable addition to reef aquariums. They are known to hide among corals and other structures and do well in reef environments.
Aquarium Setup:Set up the aquarium with a minimum tank size of 300 liters and ensure water conditions are maintained within the recommended parameters: a temperature range of 22.2-25.6°C, pH of 8.1-8.4, and a specific gravity of 1.020-1.025. Provide hiding places among stony corals and other structures for the fish to feel secure.
Behavior:Black-axil chromis are generally peaceful but may show aggression towards each other, especially when establishing dominance within a group. They tend to swim in shoals, which can transition into territorial behavior as they mature.
Feeding and Diet:Their diet should include small crustaceans like krill and artemia, as well as zooplankton such as Cyclops and pods. Feeding several times a day is recommended, especially for newly introduced specimens.
Dimorphism:In terms of dimorphism and captive reproduction, this species can be bred in captivity. When acquiring Black-axil chromis, consider requesting captive-bred specimens from local fish stores to support sustainable practices.
Habitat and Distribution:Native to the Indo-Pacific region, Black-axil chromis are found in most Oceania islands, Australia, and parts of the Indian Ocean. They inhabit coral reefs and are often observed hiding among stony corals, demonstrating a preference for sheltered environments.