Saltwater Fish · Dwarf Angelfish
Coral Beauty Angelfish
Centropyge bispinosa
Hardy, colourful dwarf angel for reef tanksIntermediate
- Lifespan
- 5-10 years
- Size
- 3-4.5 in8-11 cm
- Social needs
- Usually one dwarf angel per tank
- Time
- Medium
- Cost
- High
- Diet
- Omnivore, algae and meaty foods
Overview
What is this animal?
- The Coral Beauty is one of the hardier and more popular dwarf angelfish, known for its deep blue and orange colouring.
- It stays small at around 4 in10 cm, making it suitable for reef tanks far smaller than the large angels need.
- It is a good intermediate species: forgiving of minor mistakes but still needing a mature system with plenty of live rock for grazing and stable marine chemistry.
Temperament
- Reef-safe with caution: most individuals leave corals alone, but some nip at LPS, SPS, or clam mantles, and behaviour varies between specimens.
- It is semi-aggressive and territorial toward other dwarf angels.
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- Keep only one Centropyge per tank unless the system is large.
- It generally coexists peacefully with most community reef fish once established and given its own territory.
A good fit for
- Reef keepers wanting a hardy dwarf angel
- Reefs too small for the large angelfish
- Aquarists with mature, algae-rich rock
- Intermediate hobbyists building experience
Common mistakes to avoid
- May nip corals and clam mantles
- Added to immature tanks with little algae
- Keeping multiple dwarf angels together
- Skipping quarantine and risking ich
Enclosure
Minimum 145 gallons550 litres
One of its kind per tank; other compatible species can share it. Usually one dwarf angel per tank
- House in an established reef of at least 146 gallons550 L and 4 ft120 cm long, with abundant live rock that provides algae growth, grazing surfaces, and hiding caves.
- Care references give 70-75 gallons265-284 L and call about 40 gallons150 litres a bare minimum, but this is an active, boisterous grazer that patrols a territory all day, and a German reef encyclopedia asks at least 145 gal550 L, above the 130 gal500 L Austria's law asks for a dwarf angel.
- A mature tank with natural microfauna and algae film suits it best.
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- Maintain temperature 75-81°F24-27°C, salinity 1.024-1.026, pH 8.1-8.4, and ammonia and nitrite at zero.
- Good filtration and stable parameters keep this fish thriving.
Supplies
Setup
- Tank, stand and sump
- Return pump and powerheads
- Protein skimmer
- Reef lighting
- Rock and sand
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- Salt mix, refractometer and test kits
- Quarantine tank
Ongoing
- Spirulina-based marine flake
- Quality marine pellet
- Dried marine algae (nori) sheets
- Veg clip
- Frozen mysis and brine shrimp
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- Vitamin or HUFA soaking supplement
- Small thawing cup and strainer
Safe substrate: Aragonite sand · Dry or cured live rock
Care routine
Daily
- Check salinity, temperature and flow
- Feed a varied, algae-rich diet
- Head-count and look everyone over
- Top up evaporation with fresh water
Every few days
- Service the skimmer and filter socksevery 3 days
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Weekly
- Check corals and clam mantles
- Clean the glass
- Test the water
- Water change
Monthly
- Calibrate the refractometer
- Check salt, RO/DI and reagents
Less often
- Deep-clean pumps and powerheadsevery 3 months
- Replace RO/DI filter mediaevery 6 months
Health review: Quarterly review with a diet and coral check, every 3 months
Tools
Care in depth
Diet
Omnivore, algae and meaty foods
- An omnivore, the Coral Beauty grazes on algae, diatoms, and microfauna among the rocks.
- Supplement with spirulina-based flakes, marine pellets, dried nori, and frozen mysis or brine shrimp several times daily.
- A varied diet rich in vegetable matter keeps colour vivid and reduces nipping at corals.
- Well-fed angels are less likely to sample coral polyps or clam mantles.
Health
Signs of good health, and the common problems
- Generally robust, but like all marine fish it is susceptible to ich and velvet, so quarantine new arrivals.
- Stable water and a varied diet support a strong immune system and good colour.
- Watch for hiding, reduced appetite, white spots, or rapid gilling.
- Most health issues trace to poor water quality or stress from an immature tank or aggressive tankmates.
Is this urgent?
6 warning signs and how fast to act, 3 of them right away
In a reef, stability matters more than any single target number. A parameter moving fast does more damage than a parameter sitting slightly off.
Go now
Any detectable ammonia or nitriteWater change now with matched, mixed and aerated saltwater. Stop feeding. Ammonia is directly toxic, and at reef pH more of it is in the toxic form, so a marine system has less margin than a freshwater one. Nitrite is far less toxic in seawater, but any reading in a stocked tank means the biological filter is not keeping up.
NowTemperature or salinity has moved sharplyCorrect slowly, over hours, not minutes. Check the heater and the top-off. The speed of the change does the damage. Correcting fast repeats the injury in the other direction.
NowRapid gilling, or a fish hanging in the flow breathing hardIncrease aeration and check temperature and salinity. Warm water holds less oxygen, and a heater failure shows up here first.
NowToday
White spots, or a fine dusting like icing sugarIdentify which parasite before treating. Most reef tanks cannot be treated in place. The two common parasites look similar and need different handling; velvet can kill a tank in days.
TodayCorals closed for more than a day, or receding tissueTest alkalinity first, and compare it against the last reading rather than a target. Unstable alkalinity is the most commonly cited coral killer, and a swing shows up in the trend, never in a single point.
TodayA new fish added without quarantine now looks unwellRemove it to a separate system today if you can. Nearly every wipeout in a reef tank traces back to a skipped quarantine.
TodayQuarantine every new animal, including corals and inverts. It is the single practice that separates a reef that lasts from a reef that restarts.
This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it, and the time to find one is before you need one.
Bedding and substrate
2 safe, 3 with a caveat, 2 to avoid
In a marine system the rock and the sand are life support, and how you start them decides the first six months.
Safe
Aragonite sandThe standard marine substrate, and it hosts the biology. It does not meaningfully hold pH or alkalinity at normal reef pH, so test and dose for those regardless.
safeDry or cured live rockDry rock avoids importing pests but takes longer to mature. Cured rock is faster and riskier.
safeWith a caveat
Deep sand bedsPowerful nutrient processing when they work and a sulphide release when they are disturbed. Choose shallow or deep deliberately, not by accident. A sand-sifting or burrowing goby needs a fine bed about 2 to 3 in5 to 8 cm deep that it turns over itself. That is a different thing from a denitrifying deep sand bed (4 in10 cm or more, left undisturbed), and the two do not mix: a sifting goby disturbs the layers a deep sand bed depends on and eats the life in it.
with a caveatUncured live rockIt will cycle the tank for you, and it will also bring in whatever was living in it.
with a caveatBare bottomWorkable in high-flow systems for fish that neither sift nor burrow, but it removes a large part of the biological buffer. Wrong for watchman gobies and other gobies that burrow or sift, which need a fine sand bed at least 2 in5 cm deep to dig and feed in, and for mandarins and other copepod-eaters, which need sand as well as mature rock for their food to breed in.
with a caveatNever
Silica play sandNot the marine standard, and commonly blamed for feeding diatom blooms in a new tank.
neverAny rock or decor of unknown originMetals and phosphate leach for months and are almost impossible to trace once the tank is running.
neverThis is our general list for saltwater fish. We have not built one specific to Dwarf Angelfish yet.
Top resources for more info
Independent creators and organisations we would send a friend to. We have no affiliation with any of them, and nothing here is sponsored. Links checked 2026-10-22.
YouTubers
HumbleFish & ReefSaltwater fish disease, quarantine and treatment (Humble.Fish forum)BRStvReef tank setup, fish health and quarantine series (run by a retailer)FishOfHex AquaticsBeginner saltwater guides, avoiding common mistakes and tank disasters
Sites
Keep going
Dwarf Angelfish, side by side
Same axes, same care guides: the honest way to choose between types.
