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Purple Firefish

Nemateleotris decora

Also called Elegant firefish, Elegant firegoby

SpeciesShort profile

From Indo-West Pacific: Mauritius to Samoa, north to the Ryukyu Islands and south to New Caledonia12

At a glance the quick version

Length7.6 to 9 cm123
Sizesmall
Rich purple and gold colouring
Calm and graceful
Often kept as a matched pair
231

Looks how to spot one

Slender dartfish with a tall first dorsal fin

A slim, elegant fish with a purple head, a pale white to yellowish body that darkens toward the tail, and fins banded in purple, red, black and orange.23

Colourspurplewhite to yellowmaroonredblackorange23

Personality what they are like

Usually gentle with other fish but can squabble with its own kind unless the two are a mated pair. Quick to dart into a hole if alarmed.321

Daily activity how busy a day looks

Hovers near the bottom to catch passing food and retreats to shelter when startled.12

Grooming and care the hands-on bits

Provide rockwork and loose coral rubble for shelter and a secure lid, since it is a strong jumper. A varied, vitamin-enriched diet helps it keep its strong colours.23

Home where they are happiest

Minimum about 20 US gallons (76 L), suitable for reef and nano reef tanks. In the wild it lives deeper than the common firefish, mostly 25 to 70 m, near reef drop-offs with moderate to strong currents.321

Food basics what goes in the bowl

Carnivore that eats zooplankton such as copepods and crustacean larvae in the wild. Offer chopped seafood, frozen carnivore foods, mysis and enriched brine shrimp.13

Company who they like around

Usually seen in pairs and monogamous. Keep singly or as a mated pair.123

The story where it all began

John Randall and Gerald Allen described the species in 1973. The name decora comes from the Latin for elegant or beautiful. Some researchers treat the western Indian Ocean form as a separate species, Nemateleotris exquisita.412

Fun facts for the dinner table

  1. 1

    Its species name decora means elegant or beautiful in Latin.1

  2. 2

    It lives deeper than its cousin the common firefish, down to about 100 m.1

  3. 3

    Pairs stay together, and it has occasionally been spawned in aquariums.2

  4. 4

    Its colours fade if it is not given a varied, vitamin-rich diet.3

Recognised by the official bits

IUCN Red List
Least Concern (assessed 2015)1

The care rhythm a typical week and year

A typical home-care rhythm for a Purple Firefish. A starting point, not a vet's advice.

Owner questions the things everyone asks

How often should I feed my Purple Firefish?

Feed small amounts once or twice a day, as Furry Diary's starting plan suggests. This carnivore enjoys frequent, tiny meals to stay healthy and colourful.31 Pet Wiki plan

What does a Purple Firefish eat, and what should it never eat?

It eats zooplankton like copepods and crustacean larvae in the wild. Offer chopped seafood, frozen carnivore foods, mysis and enriched brine shrimp. Avoid any plant-based foods or large chunks it cannot swallow.31

How much space does a Purple Firefish need?

A minimum of about 20 US gallons (76 litres) is recommended. This fish is suitable for reef and nano reef tanks with plenty of rockwork and loose coral rubble for shelter.321

What temperature, light or water does a Purple Firefish need?

It comes from deeper waters (25 to 70 m) near reef drop-offs with moderate to strong currents. Keep water quality stable with regular temperature checks and weekly salinity tests. Use a secure lid as it is a strong jumper.321 Pet Wiki plan

How often should I clean a Purple Firefish's home?

Furry Diary's plan suggests cleaning the glass weekly and doing a 10 to 20% water change every two weeks. Top up evaporation daily with fresh RO water, not salt water. Pet Wiki plan

Can a Purple Firefish live with others?

Yes, it is usually gentle with other fish but may squabble with its own kind unless they are a mated pair. Keep it singly or as a mated pair for best harmony.321

How long does a Purple Firefish live?

Lifespan varies depending on care and environment. For specific longevity expectations, ask a good breeder or an exotic-pet vet.

Can I handle a Purple Firefish?

Handling is not recommended as it is quick to dart into a hole if alarmed and can be stressed by physical contact. Enjoy watching its graceful movements instead.321

Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.

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Where this comes from

Every fact on this page has a numbered source. Spotted an error? support@petwiki.app.

  1. FishBase: Nemateleotris decora fishbase.seused for distribution, size, depth, habitat, diet, IUCN, name meaning
  2. Wikipedia: Nemateleotris decora en.wikipedia.orgused for colours, behaviour, aquarium notes, taxonomy
  3. LiveAquaria: Purple Firefish liveaquaria.comused for care, tank size, diet, temperament
  4. Wikipedia: Nemateleotris en.wikipedia.orgused for describers and year

Checked 2026-09-30. Text is written in our own words from these sources.