Profile of the Blue Green Chromis (Chromis viridis) fish species

Blue green chromis fish with light blue and silvery scales

Although the Blue Green Chromis fish (Chromis viridis) is a member of the damselfish family, which is notorious for being rather aggressive in saltwater aquariums, the Chromis is a very placid fish. Beautiful fish to maintain in a saltwater aquarium are Blue Green Chromis, which have a body that is iridescent and light blue-green in color. When you have a school of three or more Blue Green Chromis, they prefer swimming the whole length of the tank, which adds a dazzling addition of color and movement as they dart about. The Blue Green Chromis gets along with most other fish and is reef-safe, affecting neither corals nor invertebrates (although Blue Green Chromis should not be kept with large, predatory fish, including eels, which could easily make a meal out of your Chromis).

The Blue Green Chromis is a resilient, affordable, and simple to care for small fish. Being curious and lively, blue green chromis fish are frequently seen swimming around in the aquarium. Despite being little, Blue Green Chromis are entertaining to watch. For all of these reasons, the Blue Green Chromis is a fantastic option for novices wishing to spruce up a saltwater aquarium with color and brightness.

Species Overview

Common Names: Blue Green Chromis, Green Chromis, Blue-Green Reef Chromis

Scientific Name: Chromis viridis

Adult Size: 4 inches

Life Expectancy: 8 to 15 years


Family Pomacentridae
Origin Indo-Pacific
Social Peaceful
Tank Level All levels
Minimum Tank Size 30 gallons
Diet Omnivore
Breeding Egglayer
Care Easy
pH 8.1 to 8.4
Hardness 8 to 12 dGH
Temperature 72 to 78 F (22 to 25 C)

Origin and Distribution

The Red Sea, Madagascar, Sri Lanka, Indonesia, the Philippines, Polynesia, and the Hawaiian Islands are just a few places in the Indian Ocean and Pacific Ocean where you may find the Blue Green Chromis fish. Blue Green Chromis are schooling fish that may be found in lagoons and coral reef ecosystems.

Colors and Markings

The Blue Green Chromis's most striking feature is its hue, which is an unmarked, delicate, shimmering light blue-green. When they are prepared to start constructing a nest, male Blue Green Chromis will occasionally change color while spawning, turning a light yellow tint. Blue Green Chromis may grow to be around four inches long, however the young fish that are sold in fish shops are usually between half and three inches long.


The Blue Green Chromis is a calm species that gets along with most other fish, with the exception of big predatory fish that could consume the smaller Blue Green Chromis. Always put the most calm fish species in an aquarium initially, then work your way up to the most aggressive fish species you intend to retain. This reduces fish fighting caused by territorial disputes. Because Blue Green Chromis don't harm invertebrates like shrimp and crabs or corals, they do well in both reef tanks and fish-only tanks.

Blue Green Chromis Fish Habitat and Care

Blue Green Chromis, like the majority of damselfish, are fairly resilient, making them a suitable choice for beginning aquarists. Contrary to other damselfish, Blue Green Chromis are calm and want to avoid any conflicts with the other fish in the tank. Because they like to swim, Blue Green Chromis should be kept in with rockscapes that provide enough of room for swimming from the middle to the top of the tank. Blue Green Chromis will attend school with one another. Any saltwater aquarium would benefit from having a small school of Blue Green Chromis since they are a stunning sight to behold. Aquarists who advise maintaining schooling fish in odd numbers, such Blue Green Chromis (for instance, three, five, seven or nine fish). Even though Blue Green Chromis are little, your tank has to be big enough to provide them enough of swimming room if you want to have a school. A saltwater fish tank that is overcrowded will likely have territorial disputes, poor water quality, and unhealthy fish.

Blue Green Chromis Fish Diet and Feeding 

As omnivores, Blue Green Chromis consume both plant-based and animal-based meals. However, meaty items like brine shrimp, krill, and mysis shrimp should make up the majority of the diet. Feed a range of predominantly meaty and some herbivore-friendly meals. Flakes, pellets, and frozen meals are among the food alternatives that may be fed to Blue Green Chromis. To improve fish health and maybe preserve the fish's brilliant color, some aquarists like to soak fish meal in a vitamin supplement designed especially for marine fish. Don't overfeed your fish; instead, give it a few tiny meals each day. Unwanted marine algae development and poor water quality are consequences of having too much uneaten food in your saltwater aquarium.

Gender Differences

Male and female Blue Green Chromis fish do not have discernable physical differences. However, mature males will change color during spawning, turning a light yellow. 

Breeding of the Blue Green Chromis Fish

If the aquarium's circumstances are ideal and there are no predators in the tank to devour the eggs, Blue Green Chromis will occasionally reproduce in captivity. The male Blue Green Chromis will create a nest in the sand bed, into which several females will lay a lot of eggs. The males fertilize the eggs before taking care of the nest and guarding the eggs till they hatch a little while later. The male often consumes unfertilized eggs and eggs that do not hatch.

More Pet Fish Breeds and Further Research 

If you like the Blue Green Chromis fish, and you are interested in similar fish species for your saltwater aquarium, read up on:

Check out additional fish species profiles for more information on other saltwater fish.