Black-bar chromis
The black-bar chromis (Chromis retrofasciata) is a small marine damselfish of the family Pomacentridae, native to reefs of the western Pacific. It has a dusky brown to greyish body marked by a dark vertical bar near the tail base, giving it a subtle but attractive appearance well suited to smaller reef systems. It is one of the more peaceful damselfish and can be kept singly or in small groups, where it hovers near cover rather than roaming aggressively. Its calm nature makes it a good reef community fish. A reef aquarium with plenty of live rock and branching coral for shelter suits it well, as it retreats quickly when startled. It feeds on zooplankton and accepts a range of small frozen and prepared foods offered in frequent small portions. Reef-safe with corals and invertebrates. Occasional captive breeding has been reported but is not commercially common.
Water parameters
| Temperature | 24 – 27 °C |
|---|---|
| pH | 8.1 – 8.4 |
| Carbonate hardness (KH) | 8 – 12 °dKH |
| Salinity | 33 – 35 SG |
Tank & stocking
| Minimum tank volume | 100 L |
|---|---|
| Volume budget per individual | 15 L — adds up with tank-mates |
| Minimum group size | 3 individuals (shoaling) |
“Minimum tank volume” is a reasonable floor, not an absolute limit. The per-individual budget is used by the Aqua app to estimate how heavily a tank is stocked.
Frequently asked questions
What size aquarium does Black-bar chromis need?
Provide at least 100 litres for a small group to keep Black-bar chromis in good conditions.
What water parameters does Black-bar chromis need?
A temperature of 24–27 °C, pH 8.1–8.4, saltwater.
Is Black-bar chromis peaceful or aggressive?
Its temperament is peaceful.
What does Black-bar chromis eat?
Its diet: planktivore.
How many Black-bar chromis should be kept together?
It is a social species: keep a group of at least 3.
How big does Black-bar chromis get?
Around 6 cm as an adult.
Is Black-bar chromis suitable for beginners?
Care level: intermediate.
Planning a tank with Black-bar chromis?
AquaTender turns these parameters into live advice: it checks whether your tank is big enough, how heavily it's stocked, and whether your fish are compatible — then tracks water tests, photos and maintenance for you.
Fish from the same biotope
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