Black Axil Chromis (Chromis atripectoralis)

Fish in the family Pomacentridae. Moderate care. Reef Safe.

Black Axil Chromis

Quick facts

Scientific nameChromis atripectoralis
FamilyPomacentridae
Care levelModerate
Reef safetyReef Safe
TemperamentPeaceful
Dietplanktivore
Adult size3.5 in
Minimum tank size55 gallons
Water parametersTemperature: 72-78°F pH: 8.1-8.3 Salinity: 1.02-1.025
Feeding schedule2-3 times daily

Appearance

Small chromis with a dark blue to black body and distinctive black axillary spot (behind the gill). Streamlined body shape typical of planktivorous damselfish.

Diet and feeding

Feed high-quality frozen mysis shrimp, copepods, and small prepared foods 2–3 times daily. Supplement with occasional flake or pellet food formulated for planktivores. They naturally feed on zooplankton in the reef environment.

Difficulty and care for the Black Axil Chromis

Moderate - Requires some experience due to specific dietary water or tank requirements. Best suited for intermediate aquarists.

Common health issues

Marine ich, Fin Rot, Swim Bladder Disorder, Bacterial Infections, Parasitic Infestations

Origin and habitat

Indo-Pacific region from the Great Barrier Reef to Fiji and the Solomon Islands.

Log Black Axil Chromis in your reef tank

Reef Trak gives you the full record on every species in your tank: acquisition date, source, photos, parameters at time of stocking, and links to maintenance and feeding events. Track Black Axil Chromis alongside everything else in your reef.