Electric blue from nose to tail, graceful in open water, and considerably more peaceful than many of its damselfish relatives, the Blue Chromis (Azurina cyanea) can be a spectacular addition to a large, established saltwater aquarium.
Also called the Blue Reef Chromis or Caribbean Blue Chromis, this species is native to the western Atlantic and Caribbean rather than the Indo-Pacific. It is a different fish from the familiar pale blue-green Chromis viridis so often sold as the Blue-Green Chromis.
The Blue Chromis is also larger than many aquarists expect.
Adults can reach approximately 6 inches, making this a substantial open-water damselfish rather than a tiny nano species. It is generally peaceful, reef compatible, and relatively adaptable once established, but it needs adequate swimming room, frequent access to appropriately sized foods, and thoughtful management if several are kept together.
💙 Blue Chromis at a Glance
| Care Requirement | Blue Chromis |
|---|---|
| Accepted scientific name | Azurina cyanea |
| Older scientific names | Chromis cyanea, Chromis cyaneus |
| Common names | Blue Chromis, Blue Reef Chromis, Caribbean Blue Chromis |
| Family | Pomacentridae |
| Maximum size | About 5.9 inches (15 cm) |
| Minimum tank size | About 30 gallons for one; larger strongly preferred for groups |
| Recommended group tank | 55 gallons or larger, with more space preferable |
| Temperament | Generally peaceful; intraspecific hierarchy can develop |
| Diet | Primarily planktivorous in nature; adaptable aquarium omnivore |
| Reef safe? | Yes |
| Temperature | About 72–78°F |
| pH | About 8.1–8.4 |
| Specific gravity | About 1.020–1.025 |
| Alkalinity | About 8–12 dKH |
| Care level | Easy to moderate |
| Native range | Western Atlantic and Caribbean |
| Swimming level | Primarily open and upper water column |
Blue Chromis are often marketed as easy schooling fish, but there is a little more nuance to their social behavior than that description suggests.
🔬 Is It Chromis cyanea or Azurina cyanea?
The currently accepted scientific name is:
Azurina cyanea
Older aquarium books, retailer listings, and websites frequently use:
Chromis cyanea
or occasionally:
Chromis cyaneus
The World Register of Marine Species currently treats Chromis cyanea as an unaccepted synonym of Azurina cyanea.
This taxonomic change is relatively recent in aquarium terms, so you will continue to see the old name for years.
When shopping for the fish, concentrate on correctly identifying the species rather than rejecting a retailer simply because its label still says Chromis cyanea.
🌎 Where Do Blue Chromis Come From?
Blue Chromis are Western Atlantic fish.
Their natural range includes:
- Bermuda
- Southern Florida
- The Bahamas
- The Caribbean Sea
- The Gulf of Mexico
- The Antilles
They are reef-associated fish recorded at depths of approximately 3–60 meters, although they are commonly encountered around 10–20 meters.
Adults are particularly associated with deeper outer reefs, where they often gather above the reef to feed on passing plankton.
This is important for aquarium design.
The Blue Chromis needs both:
reef structure below + open water above.
It should not be confined to a tank packed so densely with rock that there is nowhere to swim.
🎨 What Does a Blue Chromis Look Like?
A healthy Blue Chromis can be spectacularly vivid.
The body is bright blue, often appearing:
- Electric blue
- Royal blue
- Sapphire
- Deep cobalt
- Blue-violet under some lighting
Dark edging occurs along portions of the dorsal, anal, and forked caudal fins.
The body is relatively streamlined compared with many deeper-bodied damselfish.
That shape fits its open-water lifestyle.
Blue Chromis frequently hover above the reef rather than remaining tightly attached to one cave or coral head.
🔍 Blue Chromis vs. Blue-Green Chromis
These are not the same fish.
The names are confusing enough that misidentification is common.
Blue Chromis
Azurina cyanea
- Western Atlantic and Caribbean
- Rich sapphire or electric blue
- Maximum around 6 inches
- More elongated appearance
- Frequently associated with deeper outer reefs
- Does not typically form the same dense shoals associated with Blue-Green Chromis
Blue-Green Chromis
Chromis viridis
- Indo-Pacific
- Pale blue-green or turquoise
- Smaller
- Common around branching corals
- Famous for forming large wild shoals
The Blue Chromis is therefore not simply a darker color form of the Blue-Green Chromis.
They are separate species from different oceans.
For an overview of the larger group, see The Aquarista’s Chromis guide.
🔎 Blue Chromis vs. Black-Axil Chromis
Another potential source of confusion is the Blue/Green Black-Axil Chromis.
That fish is also an Indo-Pacific species and is not the Caribbean Blue Chromis.
Adult Black-Axil Chromis develop the characteristic dark marking around the base of the pectoral fin.
FishBase specifically describes Azurina cyanea as lacking the black spot at the pectoral base.
This distinction is worth checking carefully when fish are sold under vague names such as:
- Blue Chromis
- Reef Chromis
- Blue Reef Damsel
- Blue-Green Chromis
Scientific identification is always safer than relying exclusively on store common names.
📏 How Big Does a Blue Chromis Get?
FishBase records a maximum total length of:
15 cm / approximately 5.9 inches.
That is larger than the 3–4-inch maximum sometimes repeated in aquarium articles.
A mature Blue Chromis is therefore a fairly substantial damselfish.
Its active swimming behavior also means gallon volume alone doesn’t tell the whole story.
It needs room to move horizontally through the aquarium and hover above the reef structure.
🏡 What Size Tank Does a Blue Chromis Need?
Current aquarium retail guidance lists 30 gallons as a minimum.
That is reasonable as a minimum for a single specimen.
For a group, I would provide considerably more room.
A practical approach is:
- One Blue Chromis: about 30 gallons or larger
- Small group: about 55 gallons or larger
- Larger group: 75 gallons or substantially larger
Those larger recommendations are not arbitrary.
Blue Chromis can approach six inches and spend considerable time in open water. More space also allows subordinate fish to move away from dominant individuals if a social hierarchy develops.
A long aquarium is preferable to a compact cube of the same volume.
📐 Swimming Space Matters
Blue Chromis naturally spend considerable time above the reef rather than inside it.
A good aquarium therefore has:
- Open upper-water space
- Horizontal swimming lanes
- Rockwork below
- Numerous retreat areas
- Caves and coral-like structures
Avoid building a solid rock wall all the way to the water surface.
Give these fish somewhere to actually swim.
🪨 Best Blue Chromis Tank Setup
A mature reef or fish-only-with-live-rock aquarium works well.
Include:
- Established live rock
- Open swimming areas
- Caves and crevices
- Moderate-to-strong circulation
- Excellent filtration
- Good surface agitation
- Stable marine water parameters
Wild Blue Chromis retreat into coral crevices when frightened, so secure shelters remain important even though the fish spends much of its visible time in open water.
Several separate hiding areas are especially useful when keeping a group.
🌊 Water Parameters
A practical range is:
| Parameter | Recommended Range |
|---|---|
| Temperature | 72–78°F |
| pH | 8.1–8.4 |
| Specific gravity | 1.020–1.025 |
| Alkalinity | 8–12 dKH |
| Ammonia | 0 |
| Nitrite | 0 |
These ranges correspond well with common aquarium husbandry guidance for the species.
For a reef aquarium, many aquarists maintain salinity closer to natural seawater conditions within an appropriate reef range.
Above all, avoid sudden changes.
Stable temperature, salinity, pH, and oxygen levels are more important than constantly adding products to chase one perfect reading.
🌬️ Water Flow & Oxygen
Blue Chromis are active open-water reef fish.
They appreciate good circulation.
Moderate-to-strong distributed flow helps:
- Keep food suspended
- Increase oxygenation
- Maintain surface gas exchange
- Carry waste toward filtration
- Mimic the water movement of outer reef environments
Avoid creating a single overpowering jet.
The fish should be able to swim comfortably throughout the aquarium.
An especially useful setup creates stronger flow through open water and calmer regions around caves and rockwork.
🍽️ What Do Blue Chromis Eat?
Blue Chromis are frequently described in aquarium literature as omnivores.
That is reasonable when describing what they will accept in captivity.
Their natural feeding ecology, however, deserves more emphasis.
Wild adults feed in aggregations on small zooplankton, particularly copepods.
That means their aquarium diet should strongly emphasize small suspended foods.
Good options include:
- Mysis shrimp
- Copepods
- Enriched brine shrimp
- Calanus
- Small krill
- Frozen plankton blends
- High-quality marine flakes
- Small marine pellets
A varied diet is preferable to relying exclusively on one dry food.
🦐 Blue Chromis Are Plankton Feeders
Watch a Blue Chromis eat and its natural lifestyle becomes obvious.
These fish are designed to intercept tiny food items in the water column.
Rather than slowly grazing rock like a tang, they dart toward suspended prey.
This makes foods such as:
- Copepods
- Mysis
- Fine frozen plankton
- Small pellets
particularly appropriate.
Place food into an area of moving water so it remains suspended long enough for the fish to feed naturally.
🥄 How Often Should You Feed Blue Chromis?
I would favor two or three small meals per day where practical.
Wild Blue Chromis spend considerable time feeding on passing zooplankton rather than consuming one enormous meal.
Several small feedings can help maintain:
- Body condition
- Normal activity
- Color
- Reduced competition
Frequent feeding is especially helpful in a group because dominant fish cannot monopolize one single daily feeding as easily.
Do not confuse frequent feeding with overfeeding.
Offer amounts the fish can consume promptly and maintain excellent filtration.
🌿 Do Blue Chromis Need Algae Foods?
They may accept flakes or pellets containing plant material, and commercial aquarium guidance often categorizes the fish as an omnivore.
However, I would not build their diet around nori or algae grazing.
Unlike a Yellow Tang or Scopas Tang, the Blue Chromis is not primarily a reef-surface herbivore.
Small planktonic and protein-rich marine foods should receive much greater emphasis.
❤️ Blue Chromis Temperament
Blue Chromis are among the more peaceful members of the damselfish family.
They generally coexist well with unrelated community reef fish.
Potential aggression is most likely to involve:
- Other Blue Chromis
- Similar damselfish
- Competition within a small group
- Territorial conflicts in cramped aquariums
This is where the word schooling can become misleading.
🐟 Do Blue Chromis School?
In nature, Blue Chromis often feed in aggregations above reefs.
That does not guarantee that five fish placed in an aquarium will spend the next decade swimming peacefully in a perfect synchronized school.
Wild fish have virtually unlimited room to:
- Separate
- Escape aggression
- Join different aggregations
- Spread dominance across large numbers of individuals
Aquarium fish do not.
Blue Chromis can certainly create an attractive group display, but calling them guaranteed peaceful schooling fish oversimplifies their behavior.
👥 How Many Blue Chromis Should You Keep?
You have several options.
One Blue Chromis
Keeping a single specimen is reasonable.
The fish does not need five companions merely to survive.
Small Group
A small group can create attractive open-water activity in a sufficiently large aquarium.
Give them:
- Plenty of space
- Multiple retreat areas
- Frequent feeding
- Good water quality
Larger Group
Larger displays can work in appropriately large systems, but increased numbers also increase:
- Bioload
- Feeding requirements
- Disease-management complexity
- Social interactions
Do not buy six simply because an article says Chromis must be kept in sixes.
Build the group around the aquarium you actually have.
⚔️ Why Do Chromis Sometimes Disappear One by One?
Aquarists sometimes report starting with a group of Chromis and eventually ending up with far fewer fish.
Several things can contribute:
- Social hierarchy
- Repeated low-level aggression
- Competition for food
- Disease
- Shipping stress
- Poor initial condition
Reef aquarium husbandry sources have long noted that schooling species can behave differently in confined aquariums because subordinate individuals cannot simply leave the group.
Do not automatically assume every disappearing fish was killed by aggression, however.
Disease can produce an almost identical pattern.
Observe the fish closely.
🪸 Are Blue Chromis Reef Safe?
Yes.
Blue Chromis are generally considered reef compatible.
They do not normally eat:
- SPS coral
- LPS coral
- Soft coral
- Zoanthids
- Clams
- Ornamental shrimp
- Snails
Their natural food comes primarily from small organisms suspended in the water column.
This makes them excellent candidates for reef displays.
🦐 Are Blue Chromis Safe With Shrimp & Snails?
Generally, yes.
Adult ornamental animals such as:
- Cleaner shrimp
- Snails
- Hermit crabs
are normally left alone.
As with virtually any fish, microscopic larvae may be eaten if encountered because Blue Chromis are plankton feeders.
But they are not predators of adult cleanup-crew animals.
🐠 Best Tank Mates
Good potential companions include appropriately sized:
- Clownfish
- Cardinalfish
- Gobies
- Blennies
- Peaceful wrasses
- Anthias
- Orchid Dottybacks
- Tangs in sufficiently large aquariums
- Many other peaceful reef fishes
Their open-water behavior works particularly well with species occupying other areas of the aquarium.
A Bicolor Blenny, for example, spends much more time around rockwork and crevices, while Blue Chromis occupy the open water above.
💜 Blue Chromis & Orchid Dottyback
These species can work well together in an appropriately sized reef aquarium.
The Orchid Dottyback is more territorial around caves, while the Blue Chromis spends more time in open water.
Provide enough rockwork that the Dottyback can establish a territory without trying to control the entire aquarium.
🟡 Blue Chromis & Tangs
Blue Chromis may coexist successfully with surgeonfish in appropriately large systems.
Their different body shapes and feeding behaviors usually reduce direct territorial competition.
However, tangs can be extremely fast feeders.
If the aquarium contains large aggressive eaters, distribute food across several parts of the tank so the Chromis still receives enough.
🚫 Tank Mates to Approach Carefully
Use caution with:
- Large predatory groupers
- Lionfish large enough to swallow them
- Aggressive triggerfish
- Highly territorial damselfish
- Very aggressive dottybacks
- Large predatory wrasses
- Any fish capable of swallowing a Blue Chromis
Remember that a predator does not care whether an aquarium guide describes the prey species as “peaceful.”
If it fits in the predator’s mouth, compatibility may be temporary.
🐠 Blue Chromis Are Damselfish
This surprises some aquarists.
Blue Chromis belong to the family:
Pomacentridae
—the damselfishes.
That makes them relatives of many much more territorial species.
Chromis-type damselfish tend to spend considerably more time feeding in open water than classic territorial damsels that aggressively defend small reef patches.
That ecological difference helps explain their comparatively peaceful aquarium behavior.
But some of the damselfish family’s territorial tendencies can still appear, especially among members of a confined group.
🩺 Choosing a Healthy Blue Chromis
Before purchasing one, watch it carefully.
Look for a fish that:
- Swims actively
- Holds itself normally in open water
- Eats readily
- Has clear eyes
- Breathes normally
- Has intact fins
- Has no open sores
- Has no red lesions
- Has a full abdomen
- Maintains strong coloration
If purchasing a group, inspect every individual.
One compromised fish can indicate shipping stress or disease exposure affecting the entire group.
📉 Avoid Thin Fish
A Blue Chromis should not look hollow through the abdomen.
Watch for:
- Pinched belly
- Sunken sides
- Weak swimming
- Refusal to eat
- Isolation from the group
These can indicate that the fish is already struggling.
Starting with healthy, feeding specimens dramatically improves your chances of long-term success.
🏥 Quarantine
Quarantine is highly worthwhile with Chromis.
Marine fish transported and held in groups can be exposed to:
- Marine ich
- Marine velvet
- Bacterial infections
- External parasites
- Opportunistic ciliates
A quarantine period allows you to observe appetite, respiration, skin condition, and behavior before introducing the fish into a reef aquarium.
Quarantine is especially important when purchasing a group because disease can move quickly through closely housed fish.
🦠 What About Uronema?
Chromis have a reputation in the marine aquarium hobby for problems involving Uronema and related scuticociliate infections.
There is scientific evidence behind the concern.
A published study documented Uronema infection in imported Chromis viridis and Chromis vanderbilti, with affected fish showing hemorrhagic and ulcerative lesions.
That study did not specifically test Blue Chromis (Azurina cyanea), so it would be inaccurate to say that Blue Chromis uniquely suffer from “Uronema disease.”
The practical lesson is simpler:
Take red sores, ulcers, sudden lethargy, and rapid losses in any newly imported Chromis group seriously.
Quarantine gives you a much better opportunity to investigate before disease reaches the display tank.
⚪ Marine Ich
Blue Chromis can contract marine ich like other saltwater fish.
Possible signs include:
- White spots
- Scratching
- Rapid breathing
- Reduced appetite
- Hiding
- Lethargy
Do not diagnose a fish based solely on one white mark.
Several marine conditions can look superficially similar.
✨ Marine Velvet
Marine velvet can progress rapidly.
Warning signs may include:
- Very rapid breathing
- Loss of appetite
- Lethargy
- Fine dusty appearance
- Swimming near high-flow areas
- Sudden deterioration
A fish experiencing respiratory distress requires immediate attention.
Check:
- Ammonia
- Oxygen
- Temperature
- Salinity
while also investigating disease.
🚨 Signs Your Blue Chromis May Be Sick
Watch for:
- Loss of appetite
- Rapid breathing
- Red sores
- Ulcers
- White spots
- Frayed fins
- Cloudy eyes
- Isolation
- Weight loss
- Erratic swimming
- Sudden color loss
One isolated symptom may have several explanations.
A combination of symptoms deserves prompt investigation.
🎨 Why Is My Blue Chromis Losing Color?
Color intensity can change with:
- Stress
- Lighting
- Social interactions
- Poor nutrition
- Disease
- Acclimation
- Time of day
A temporarily pale fish is not necessarily sick.
More concerning is fading accompanied by:
- Rapid breathing
- Refusal to eat
- Weight loss
- Hiding
- Visible lesions
Evaluate the whole fish rather than color alone.
🌙 Do Blue Chromis Sleep?
Like other reef fish, Blue Chromis need a resting period.
At night they may retreat toward:
- Rock crevices
- Coral-like structures
- Sheltered portions of the reef
FishBase notes that wild Blue Chromis retreat into coral crevices when frightened.
Provide enough structure that every fish in a group can find shelter.
🚀 Can Blue Chromis Jump?
Any startled open-water marine fish can potentially leave an aquarium.
A secure lid or mesh top is a sensible precaution.
Jumping risk may increase during:
- Initial acclimation
- Aggression
- Chasing
- Sudden lights
- Startling maintenance
Check openings around power cords, plumbing, and overflow equipment.
🥚 Breeding Blue Chromis
Blue Chromis are egg-laying fish.
FishBase reports that breeding involves distinct pairing.
The eggs are:
- Demersal
- Adhesive
- Attached to the substrate
The male guards and aerates the eggs after spawning.
This parental care is typical of many damselfish.
👶 Raising Blue Chromis Fry
Getting adults to spawn does not mean the babies are easy to raise.
Marine fish larvae can require:
- Dedicated larval tanks
- Rotifers
- Copepod nauplii
- Microalgae cultures
- Frequent feeding
- Excellent water quality
- Careful control of food density
The larval stage is the real challenge.
Breeding Blue Chromis should therefore be treated as an advanced marine-aquaculture project.
⏳ How Long Do Blue Chromis Live?
Reliable species-specific aquarium longevity data for Azurina cyanea are limited.
I would avoid promising a particular number of years.
Long-term survival depends on:
- Initial health
- Shipping history
- Diet
- Aquarium size
- Water quality
- Disease
- Group dynamics
- Tank mates
A healthy Blue Chromis should be considered a multi-year commitment rather than a disposable “starter fish.”
⭐ Are Blue Chromis Good for Beginners?
They can be a good choice for an aquarist who already has a properly cycled saltwater aquarium.
Advantages include:
- Relatively peaceful temperament
- Reef compatibility
- Acceptance of prepared foods
- Active swimming behavior
- Beautiful coloration
- Moderate husbandry requirements
The main cautions are:
- They grow larger than many people expect.
- Groups need more space than a single fish.
- Aquarium shoaling behavior is not always perfectly peaceful.
- Newly imported Chromis deserve careful quarantine.
- They need frequent access to appropriately sized foods.
So I would rate the Blue Chromis:
easy to moderate for an established marine aquarium—not a fish for an uncycled first-day saltwater tank.
⚠️ Common Blue Chromis Care Mistakes
Confusing It With Blue-Green Chromis
The Caribbean Blue Chromis is Azurina cyanea, not Chromis viridis.
Using the Old 3–4-Inch Adult Size
The species can reach approximately six inches.
Treating 30 Gallons as Ideal for a Group
Thirty gallons is a minimum guideline. A group deserves considerably more swimming room.
Assuming They Must Be Kept in a Large School
Wild aggregation does not guarantee perfect aquarium schooling behavior.
Buying a Group and Ignoring Bullying
Watch subordinate fish for damaged fins, hiding, and weight loss.
Feeding Only Once Per Day
Small planktivorous fish benefit from multiple feeding opportunities.
Feeding Primarily Algae
Their natural diet emphasizes zooplankton.
Keeping Them With Aggressive Damselfish
Not all members of Pomacentridae have the Blue Chromis’s relatively mild temperament.
Skipping Quarantine
Group-housed marine fish can arrive with disease.
Packing the Entire Tank With Rock
Blue Chromis need open water above and around the reef structure.
❓ Blue Chromis FAQ
What is the scientific name of the Blue Chromis?
The currently accepted name is Azurina cyanea. The older name Chromis cyanea remains very common in aquarium literature.
How big does a Blue Chromis get?
FishBase records a maximum total length of approximately 15 cm, or 5.9 inches.
What size tank does a Blue Chromis need?
About 30 gallons is a minimum for a single specimen. I recommend substantially more space for a group, with 55 gallons or larger providing a better starting point.
Are Blue Chromis reef safe?
Yes. They are generally compatible with corals and common reef invertebrates.
Are Blue Chromis freshwater or saltwater fish?
They are marine reef fish.
Where do Blue Chromis come from?
They are native to the western Atlantic and Caribbean, including Bermuda, southern Florida, the Bahamas, Gulf of Mexico, and Antilles.
What do Blue Chromis eat?
Their natural diet is dominated by small zooplankton such as copepods. In aquariums they readily accept mysis, enriched brine shrimp, plankton blends, flakes, and small pellets.
How often should Blue Chromis be fed?
Two or three smaller meals per day are useful where practical.
Do Blue Chromis need to be kept in groups?
No. They may be kept singly or in groups. Wild fish commonly feed in aggregations, but aquarium groups can develop hierarchies.
How many Blue Chromis should I keep?
Choose group size according to aquarium size rather than following a fixed rule. A single fish is acceptable; small groups need considerably more space.
Are Blue Chromis aggressive?
They are generally peaceful compared with many damselfish but may show intraspecific aggression.
Can Blue Chromis live with clownfish?
Usually yes in a sufficiently large aquarium, although very territorial clownfish should be monitored.
Can Blue Chromis live with tangs?
Yes, in a tank large enough for the tang species.
Is a Blue Chromis the same as a Blue-Green Chromis?
No. Blue Chromis is Azurina cyanea from the western Atlantic. Blue-Green Chromis is Chromis viridis from the Indo-Pacific.
Is a Blue Chromis a damselfish?
Yes. It belongs to the damselfish family Pomacentridae.
Can Blue Chromis get Uronema?
Related Chromis species are documented hosts of Uronema infections. Because disease symptoms can overlap and Blue Chromis-specific evidence is limited, quarantine and accurate diagnosis are preferable to assuming every red lesion is Uronema.
Are Blue Chromis good beginner fish?
They can be good early marine fish once the aquarium is fully cycled and established, but quarantine, proper feeding, and adequate swimming space remain important.
💙 An Underrated Caribbean Reef Fish
The Blue Chromis deserves more attention than it receives.
Its color is extraordinary.
Not pale turquoise.
Not blue-green.
Blue.
A healthy adult hovering over reef rock can look almost illuminated under aquarium lighting.
Its temperament is also much more manageable than many damselfish, and its natural open-water behavior brings constant movement to the upper portion of a reef display.
But good care begins with recognizing what the fish actually is.
It is Azurina cyanea, a Caribbean and western Atlantic reef fish capable of reaching nearly six inches.
It is primarily a plankton feeder.
It does not need to be forced into an arbitrary school.
And a group deserves considerably more room than the 30-gallon minimum frequently repeated on retail care charts.
Give your Blue Chromis open swimming space, reef structure for shelter, good circulation, clean oxygen-rich water, several small feeding opportunities, peaceful tank mates, and careful quarantine.
Do that, and this vivid Caribbean damselfish can become one of the brightest animals in your reef aquarium.
🔗 Related Articles
- Chromis
- Green Chromis
- Yellowtail Damselfish
- Zebra Damsel
- Banggai Cardinalfish
- The Top 50 Saltwater Fish for Aquariums
📚 Sources
- FishBase — Azurina cyanea (Blue Chromis)
- World Register of Marine Species — Chromis cyanea / Azurina cyanea
- Smithsonian Tropical Research Institute — Azurina cyanea (Blue Chromis)
- Smithsonian Tropical Research Institute — Blue Chromis Habitat, Diet & Biology
