Dartfish

2 available — graceful dartfish and firefish with vivid markings, elegant fins, and quick retreat behavior.
Dartfish, including popular firefish, are admired for slender profiles, expressive dorsal fins, and hovering behavior near shelter. Species differ in social needs, adult size, coloration, and compatibility.Browse current arrivals, then explore more saltwate... Read more Show less

Dartfish, including popular firefish, are admired for slender profiles, expressive dorsal fins, and hovering behavior near shelter. Species differ in social needs, adult size, coloration, and compatibility.

Browse current arrivals, then explore more saltwater fish for peaceful marine displays.

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  • Helfrichi Firefish Goby
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    Helfrichi Firefish Goby

    Helfrichi Firefish Goby
    Starting at$159.99

    Almost WYSIWYG Fish

    Nemateleotris helfrichi

    Care Level Easy
    Temper­ament Peaceful
    Reef Safe Yes
    Diet Omnivore
    Tank Size 30 gallons
    Max Size 3 inches
  • Blue Gudgeon Dartfish
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    Blue Gudgeon Dartfish

    Blue Gudgeon Dartfish
    Starting at$52.99

    Almost WYSIWYG Fish

    Ptereleotris heteroptera

    Care Level Easy
    Temper­ament Peaceful
    Reef Safe Yes
    Diet Carnivore
    Tank Size 30 gallons
    Max Size 5.5 inches

Top picks

Popular Dartfish

Compare the strongest options in this collection at a glance.

Answers

Do dartfish and firefish need a covered aquarium?
A secure, well-fitted cover is strongly recommended because dartfish may jump when startled, chased, or exposed to sudden activity around the aquarium.
Can firefish be kept together?
Group and pair compatibility varies by species and maturity. Unbonded individuals may become territorial, so research social behavior and watch for persistent chasing.
What do dartfish eat?
Many dartfish accept small marine meaty foods, pellets, or flakes drifting in the water column. Shy specimens may need food delivered close to shelter.
Are dartfish reef safe?
Many commonly offered dartfish are maintained with corals and peaceful invertebrates, although very small prey and species-specific behavior should be considered.
How should a firefish be acclimated?
Acclimate carefully for temperature and salinity, keep lighting low, secure every opening, and release the fish near an established cave or protected retreat.

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More info and buying tips

Dartfish and Firefish Selection and Care Guide

Choosing a Dartfish

Select a dartfish with clear eyes, an intact body and fins, controlled hovering, and a prompt retreat response that is not accompanied by frantic breathing. Ask whether it is feeding and whether it has shown conflict with similar fish. Verify the species before pairing it with other saltwater fish.

Secure Habitat and Acclimation

Use a tight-fitting lid and close gaps around plumbing because startled dartfish can find small openings. Provide open water near caves, ledges, or burrows so the fish can retreat instantly. Acclimate according to shipping salinity, dim the lights, and release near shelter. Covers and testing aquarium supplies should be ready first.

Feeding Near Shelter

Offer small, appropriately sized foods that drift within reach of the fish's refuge. Timid dartfish may remain hidden when faster tankmates rush the feeding area, so distribute portions or target-feed when needed. Explore fish food options for marine carnivores, vary the menu, and confirm that the fish emerges regularly to eat.

Compatibility and Observation

Choose peaceful companions that will not chase the dartfish away from its shelter. Social tolerance among dartfish depends on species, pairing, maturity, and available territory, so adding several fish requires research. Many are commonly kept in reef displays, but every new introduction should be observed. Persistent hiding, missed meals, or rapid breathing can indicate stress.