Does a Firefish aquarium need a lid?

Yes. Firefish are documented jumpers, especially when startled, so a tightly fitted lid with no escape gaps is essential.

Can more than one Firefish be kept together?

A confirmed pair can coexist, but unrelated adults often fight. A single fish or an established pair is the safer choice unless a large aquarium provides abundant food and multiple separate hiding places.

Is the Firefish safe with corals and ornamental shrimp?

Yes. It is not expected to damage corals, and it is documented as leaving ornamental crustaceans such as shrimp unharmed.

Firefish

Nemateleotris magnifica

Firefish Reef Safe Carnivore Jumper

Care Level

Easy

Temperament

Peaceful

Reef Safe

Yes

Max Size

3 inches

Min Tank

20 gallons

Origin

Indo-Pacific

Diet

Carnivore

Food

Mysis Shrimp, Enriched Brine Shrimp, Plankton, Finely Chopped Seafood, Small Marine Pellets, Marine Flakes

Firefish's Available Now

Helfrichi Firefish Goby
Almost WYSIWYG Fish
$159 ⁹⁹

The Firefish, Nemateleotris magnifica, is a slender, elongated dartfish instantly recognized by its color gradient: a yellow snout and head, a pale white anterior body, and a bright orange-red to dusky-red posterior, with dark-edged median fins. Its signature feature is the elongated, pennant-like first dorsal fin, which the fish flicks and waves almost constantly while hovering. The species ranges widely across tropical Indo-Pacific reefs, from East Africa through the Indian and Pacific oceans to Hawaii and French Polynesia, where it typically occupies upper outer reef slopes. Adults reach roughly 3 inches, with published maximums extending to about 3.5 inches.

A 20-gallon aquarium is the practical minimum for an adult, though the fish will make use of any additional open swimming space. Build the layout around substantial rockwork set on sand or rubble, with numerous cracks, caves, and secure bolt-holes the fish can dart into, balanced against open water where it can hover and intercept food. Moderate to strong flow is beneficial because it carries suspended particles past the fish in the same way current does on a reef slope. Stable tropical marine conditions and a tightly fitted lid with no escape gaps are both essential, since a startled Firefish will readily jump.

On the reef, this dartfish faces into the current and picks zooplankton from the water column, concentrating on copepods and other crustacean larvae. That feeding style translates directly to the aquarium: it responds best to small, meaty items that drift past at mid-water rather than food that settles onto rock or sand. Suitable offerings include mysis shrimp, enriched brine shrimp, plankton, finely chopped seafood, and appropriately sized pellets, flakes, and prepared marine foods.

Feed small portions at least twice daily, and more frequently if the schedule allows, since a fish of this size processes modest amounts at a time. Shy individuals sometimes retreat to their bolt-hole during feeding and miss meals entirely when housed alongside aggressive or fast-feeding tankmates. Watch new arrivals closely to confirm that food is actually reaching them, and target-feed near the rockwork if needed until the fish feeds confidently in open water.

Mysis Shrimp Enriched Brine Shrimp Plankton Finely Chopped Seafood Small Marine Pellets Marine Flakes

Firefish are peaceful, active hoverers that spend the day suspended just above their chosen patch of rock, fins twitching, and vanish into a burrow or crevice the moment something startles them. Juveniles may gather in loose groups or share a hole, while adults are usually solitary or paired and form monogamous bonds. In the aquarium, individuals can become territorial toward conspecifics, so keep either a single fish or a confirmed pair unless the system is large enough to supply abundant food and clearly separated refuges. Tankmates should be chosen carefully: avoid aggressive, boisterous, or predatory fish, along with highly competitive feeders that can harass the Firefish or simply outcompete it at mealtimes.

This is a reliable reef aquarium inhabitant. It poses no threat to corals and is not expected to disturb sessile invertebrates, and it is documented as leaving ornamental crustaceans such as shrimp unharmed. Given its small adult size and zooplankton-feeding habits, it fits naturally into mixed reef displays stocked with similarly mannered fish, where its hovering posture and waving dorsal pennant remain on display throughout the day.

Recommended Products

Premium Fish Food - Pellets - Reef Genetics

$11.99

FAQ

Frequently Asked Questions

About the Firefish

Does a Firefish aquarium need a lid?

Yes. Firefish are documented jumpers, especially when startled, so a tightly fitted lid with no escape gaps is essential.
Can more than one Firefish be kept together?

A confirmed pair can coexist, but unrelated adults often fight. A single fish or an established pair is the safer choice unless a large aquarium provides abundant food and multiple separate hiding places.
Is the Firefish safe with corals and ornamental shrimp?

Yes. It is not expected to damage corals, and it is documented as leaving ornamental crustaceans such as shrimp unharmed.

Shop

Shop Related

Hand-picked Firefish & Dartfish for your Firefish.