Species description

Care, breeding and tankmates

Fish profile

Temperament

Peaceful

Very peaceful and active, they are ideal for adding life to the top of a reef tank. As they mature, minor squabbles can occur if the tank is too small. Overall, they remain one of the most docile schooling fish available in the marine hobby.

Diet

Omnivore

These omnivores thrive on a diverse diet of zooplankton and fine meaty foods. Feed them enriched brine shrimp, cyclops, and finely crushed marine flakes. Regularly varied diets are critical for maintaining their striking, iridescent blue coloration.

Sex ratio

Solitary

A large shoal of six or more individuals balances internal aggression perfectly. There are no reliable physical differences between the sexes outside of breeding time. Odd numbers generally help establish a stable hierarchy within the group.

Feeding frequency

TWO_THREE_DAILY

They demand small feedings three to four times a day for optimal health. This frequent feeding schedule mirrors their continuous foraging in the wild. If fed too infrequently, they can lose body mass and color quickly.

Bioload

The Blue Chromis imparts a very light bioload individually, making them great for reefs. Because they are kept in schools, a high-quality protein skimmer is recommended. Consistent water maintenance ensures their vibrant blue color remains pristine.

Flow

Strong

They favor moderate to strong water currents to mimic the turbulent reef crests. Good water movement encourages schooling and keeps food suspended for easier consumption. Directional powerheads can create the perfect environment for these active swimmers.

Jump risk

Yes

Blue Chromis are notorious jumpers when startled by tank mates or sudden lights. A tight mesh cover is mandatory to keep them from jumping out of the aquarium. Careful tank maintenance also minimizes their stress-induced darting behavior.

Reproduction

Oviparous

They occasionally spawn in the home aquarium, laying eggs on the glass or rocks. The male fiercely defends the nest against all intruders until the larvae hatch. Raising the microscopic fry requires specialized rotifer cultures and is extremely challenging.

Compatibility & tankmates

Reef safe

Completely reef-safe and extremely peaceful, they will not bother corals or invertebrates. They mix perfectly with tangs, blennies, and peaceful wrasses. Avoid aggressive tank mates that might harass them or view them as prey.

Tank level

Top/Middle

They are upper-water column dwellers that swim actively in the open. They need plenty of unobstructed horizontal space to exhibit natural schooling behaviors. At night, they seek refuge in the branches of SPS corals or rocky crevices.