The orchid dottyback is a head-to-tail royal purple fish endemic to the Red Sea, and one of marine aquaculture's success stories: virtually every fish sold is captive-bred.
That makes it hardy, parasite-resistant, and pre-adapted to aquarium life.
Unlike its notoriously mean dottyback cousins, the orchid is comparatively mild-mannered — bold enough to own its patch of rockwork, rarely a genuine bully.
Housing
Provide 100 litres (26 gallons) or more with generous rockwork: dottybacks live in and out of crevices, darting along walls and overhangs.
A tight lid is non-negotiable — startled dottybacks are accomplished jumpers.
Diet
Feed meaty frozen foods — mysis and enriched brine shrimp — once or twice daily, alongside a quality small marine pellet most captive-bred fish already recognise.
They feed eagerly from the water column.
Varied feeding keeps the famous purple saturated; a dottyback on flake alone slowly washes out.
Health
Captive-bred orchids are among the toughest small marine fish available, with no species-specific weaknesses.
Standard quarantine remains good practice in any established system.
Most losses are mechanical: jumping through open lids or vanishing into aggressive tankmates' territories.
Fix both at setup time.
Temperament
Expect a confident, curious fish that patrols its rock patch and greets the glass at feeding time.
It holds its own against semi-assertive tankmates far larger than itself.
Keep one per tank and avoid housing with similarly shaped, similarly coloured fish (other dottybacks, royal grammas) in ordinary systems — the resemblance triggers turf wars.
With dissimilar peaceful fish it is a model citizen.
A good fit for
First marine fish alongside clownfish-grade species
Reef tanks wanting a splash of true purple
Keepers who value captive-bred livestock
Mid-sized mixed communities with rockwork
Common mistakes to avoid
Pairing with royal grammas or other dottybacks
Open-topped tanks — they jump
Very timid tankmates being chased off food
Confusing it with meaner dottyback species
Is your enclosure big enough?
Minimum volume100 litres (26 US gallons)
CompanyMust be housed alone. One per tank; territorial with similar shapes
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. Directly toxic, and a marine system has less margin than a freshwater one.
Now
Temperature 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.
Now
Rapid 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.
Now
Today
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.
Today
Corals 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.
Today
A 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.
Today
Quarantine 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.
What it really costs
Setup, monthly, first year and across a whole life, itemised and with the electricity worked out from the actual wattage. Published figures for the same animal disagree by a factor of four, so the calculator shows ranges rather than picking one.
Beginner
Beginner
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