Saltwater Fish

Orchid Dottyback

Pseudochromis fridmani

Vivid purple Red Sea jewel, almost always captive-bredBeginner

Lifespan: 5-7 years
Size: 2.8 in
Social needs: One per tank; territorial with similar shapes
Time: 15-20 min daily; reef-standard upkeep
Cost: Medium
Diet: Carnivore (frozen mysis, enriched brine, pellets)

Overview

What is this animal?

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, usually parasite-free on arrival, 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.

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.

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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

Enclosure

Minimum 53 gallons

One of its kind per tank; other compatible species can share it. One per tank; territorial with similar shapes

Provide 53 gallons or more with generous rockwork: dottybacks live in and out of crevices, darting along walls and overhangs.
They are completely reef-safe with corals.

Standard stable reef parameters suit them: 75-79°F, salinity 1.024-1.026, low nitrate.
A tight lid is non-negotiable: startled dottybacks are accomplished jumpers.

Check your enclosure

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

Frozen mysis shrimp
Frozen enriched brine shrimp
Quality small marine pellet
Frozen chopped seafood blend
Vitamin or HUFA soaking supplement

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Small thawing cup and strainer
Turkey baster for target-feeding

Safe substrate: Aragonite sand · Dry or cured live rock

Work out the cost

Care routine

Daily

Check salinity, temperature and flow
Check the lid
Feed
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 who is being chased
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 an aggression check, every 3 months

Tools

Is your enclosure big enough?Check your measurements against the recommended size What will it cost?Setup, monthly and over its whole life, itemised Is this ammonia reading dangerous?Works out the toxic part from your pH and temperature

Care in depth

Diet

Carnivore (frozen mysis, enriched brine, pellets)

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

Signs of good health, and the common problems

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.

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.

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.

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.

safe

Dry or cured live rockDry rock avoids importing pests but takes longer to mature. Cured rock is faster and riskier.

safe

With 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 in deep that it turns over itself. That is a different thing from a denitrifying deep sand bed (4 in 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 caveat

Uncured live rockIt will cycle the tank for you, and it will also bring in whatever was living in it.

with a caveat

Bare 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 in 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 caveat

Never

Silica play sandNot the marine standard, and commonly blamed for feeding diatom blooms in a new tank.

never

Any rock or decor of unknown originMetals and phosphate leach for months and are almost impossible to trace once the tank is running.

never

This is our general list for saltwater fish. We have not built one specific to Dottybacks yet.

Top resources for more info

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