Blue-green Chromis

Green Chromis ~ Blue Green Damselfish    

Family: Pomacentridae Picture of a Blue-green Chromis or Green Chromis, Chromis viridisChromis viridisPhoto © Animal-World: Courtesy David Brough
Latest Reader Comment - See More
very hardy. easy to take care.  Calvin

   The Blue-green Chromis or Green Chromis is one damselfish that is peaceful, even as an adult, and can be kept with many other community species.

   The Blue-green Chromis or Green Chromis is considered an excellent choice for the marine aquarium, and are almost always available from a marine fish supplier. They are a wonderful schooling fish, and in the wild are found in large shoals. You will notice that the Blue-green Chromis or Green Chromis has slight color variations from a pale green to a light blue. The mature male in a nesting mood will be yellow.

For more Information on keeping this fish see:
Guide to a Happy, Healthy Marine Aquarium

Geographic Distribution
Chromis viridis
Data provided by
  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Actinopterygii
  • Order: Perciformes
  • Family: Pomacentridae
  • Genus: Chromis
  • Species: viridis
Blue-green Chromis schooling in Aquarium, Chromis viridis
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Blue Green Chromis in captivity.

The Blue Green Chromis, Chromis viridis, does wondering in groups of 6 or more. The tank should be at least 55 gallons and in a reef they are amazing! My Blue Green Chromis loved to sleep in the branches of my branching Montipora Digitata at night. They feel safe in numbers and are just as peaceful as the nicer clownfish and can be housed in the same tank. Avoid aggressive clownfish however, and opt for the Percula, Ocellaris or Skunk Clownfish as tank mates. Do not house with triggers, large angelfish or other aggressive fish, and avoid predators since Blue Green Chromis are quite low on the food chain!

Blue green chromis, Chromis viridis in the wild
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Blue Green Chromis in the wild.

This is an excellent video of the normal numbers that the Blue Green Chromis is used to being in. If being kept in captivity, you can enjoy their schooling in groups of 6 or more, in an aquarium that is 55 gallons or more. Do not house with aggressive fish, especially more aggressive clownfish like Tomatos, Cinnamon, Clarki, Maroon or the like. House with the peaceful clownfish like the Ocellaris (Nemo), Percula or the Skunk Clowns. If keeping one, they may not fare as well unless they are the only fish in a 30 gallon tank, since they do find comfort in numbers. They do not ship well, so make sure they are looking good in your LFS tank and eating before buying. Feed several times a day and for added pleasure, having a large Montipora Digitata or similar branching SPS will give them a safe place to sleep at night or when frightened.

Habitat: Natural geographic location:    Blue-green Chromis or Green Chromis are found throughout the Indo-West Pacific from eastern Afraca and the Red Sea to the islands of Oceania (not Hawaiian Islands). Found at depths up to 12 meters, it inhabits inshore and lagoon reefs, associated with branching corals, especially Acropora.

Status:    These fish are not listed on the IUCN Red List.

Maintenance difficulty:    The Blue-green Chromis or Green Chromis is among the easiest of all marine fish to keep.

Maintenance:    This fish will readily eat all kinds of live, frozen, and flake foods and algae. Finely chopped meaty foods (like brine shrimp) can be fed regularly. It is best to feed small amounts several times a day. In a reef situation they don't really need to be fed very often at all.

Foods:    All kinds. See "maintenance" above.

Social Behaviors:    This damselfish is the exception to the rule for damsels. It is peaceful even into adulthood and can be kept together with most any other fish.

Sex: Sexual differences:    A mature nesting male will be yellow.

Light: Recommended light levels:    No special requirements.

Breeding/Reproduction:    Some of the damselfish have been bred in captivity. See general breeding techniques under Clownfish on the marine breeding page.

Temperature:    No special requirements.

Length/Diameter of fish:    Blue-green Chromis or Green Chromis adults can grow to 7.0 cm ( 2.8 inches).

Minimum Tank Length/Size:    A minimum 15 gallon aquarium is recommended if this is the only fish to be kept in it.

Water Movement: Weak, Moderate, Strong    No special requirements. Picture of a Blue-green Chromis or Green Chromis

Water Region: Top, Middle, Bottom    Swims at all levels of the aquarium.

Availability:    This fish is readily available.

Author: David Brough. CFS.
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Lastest Animal Stories on Blue-green Chromis

Calvin - 2005-05-08
very hardy. easy to take care.

FaJaun Fairrow - 2012-11-06
I'd like to know what would be a good number of these Chromises to add in a 75 gallon tank ?

  • Jeremy Roche - 2012-11-06
    How many inches of substrate do you have and how much in the way of decor?
Andy - 2008-06-24
These fish are always active even at night. They school during the day and at night they separate into groups of two. I have 10 of these chromis and they get along with my clownfish, tangs, shrimps, and don't nip at my clams or corals. But they do like to play (chase) each other around my elephant ear coral, and they bring water movement to it. I highly recommend this fish to everybody, experienced and beginners.

Maria - 2010-12-30
I bought several chromis when I started my tank and the lonely survivor beat the stuffing out of all others. (and out of any later ones I added - in groups) So this guy is now the only one. I'm not getting any more because that would just be a waste of perfectly happy little fish (and money).

GARF lover - 2006-09-28
My chromis fishes have very unique personalities. The larger green one seems to pick on the smaller blue one. The green chromis has gone to the point in which he's bitten the top part of the fin of the blue chromis. They also hide behind the coral whenever I walk by my tank. Ive seen chromis adults 8in long in my local petstore.

  • Anonymous - 2010-02-25
    No, not 8 inches
  • Anonymous - 2012-07-14
    Were they the same species of chromis?

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