Chromis cyanea

Other Common Names for the Green Chromis:

Blue Chromis


There are over 385 species of fishes in the Pomacentridae family. That family contains a subfamily called “Chominae.” This subfamily is home to over 80 species of Chromis. The Blue Reef Chromis has a very wide distribution and can be found throughout the Indo-Pacific region. They inhabit lagoons and reefs ranging from Madagascar to the Philippines to Hawaii.

Blue Reef Chromis are a shimmery, deep blue coloring with a distinctive black outline along the bottom of the dorsal fin and around the caudal fin. They are a smaller fish, only growing to 5 inches in length. A single Blue Reef Chromis is perfect for any size tank. They do prefer to shoal in groups. For a small group of Blue Reef Chromis (4-6), it is recommended to have a tank that is at least 30 gallons or larger as they will need some swimming space.


Blue Reef Chromis are omnivores. They will feed on a wide range of foods. On their own, they will scavenge for small bites like tiny shrimp and algae. They will enjoy a varied diet consisting of flakes, pellet food, high-quality frozen foods, and some meaty foods, such as brine and mysis shrimp.


Being from the damselfish family, one would expect Blue Reef Chromis to be a little more aggressive. However, these little gems are very peaceful.  The only aggression you will see is within their own group/species. They will occasionally nip and chase each other to establish a pecking order. (Somebody has to be the boss, right?)  During waking hours, the Blue Reef Chromis hang out in the front of your tank. They are not shy fish.  At night, they will find a cave or a safe area and sleep as a group. Blue Reef Chromis are easy to care for and make a great addition to any mixed reef.



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