Firefish Care Guide (2026)

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The firefish (Nemateleotris magnifica) is one of the best beginner saltwater fish available. Hardy, peaceful, and strikingly colored, firefish are reef safe, easy to feed, and do not require a large tank. Their main challenge is jumping - firefish are prolific escape artists and require a tight-fitting lid without exception.

Firefish at a Glance

Scientific name	Nemateleotris magnifica
Adult size	3 inches
Minimum tank size	20 gallons
Salinity	1.020-1.025
Reef safe?	Yes
Jumping risk	Very high - lid essential
Difficulty	Beginner-friendly

Tank Size

Minimum 20 gallons for a single firefish. 30+ gallons recommended for a community reef. Firefish need rockwork with bolt holes - small caves or crevices the fish can instantly retreat into when startled. See our Best Saltwater Aquarium Tanks guide.

Water Parameters

Ammonia and nitrite at 0 ppm, nitrate below 20 ppm, salinity 1.020-1.025. Test weekly. Use an auto top-off system to prevent salinity drift. See our Best Reef Test Kits and Best Auto Top-Off Systems guides.

Aquarium Setup

Firefish hover in the mid-water column and dart into rockwork when startled. Provide live rock with plenty of bolt holes throughout the tank. A firefish without adequate bolt holes will be chronically stressed. See our Best Live Rock and Reef Rock guide.

The Lid - Non-Negotiable

Firefish are among the most jump-prone fish in the marine hobby. A tight-fitting lid or mesh screen cover is the single most important piece of equipment for a firefish tank. Many firefish are lost in the first weeks after introduction. Do not keep firefish in an open-top tank. See our Firefish Jumping guide.

Feeding

Carnivorous planktivores that accept most foods readily. Frozen mysis shrimp is an excellent staple food and is readily accepted by most firefish. Also accepts pellets, brine shrimp, and copepods. Frozen or live copepods are an excellent supplement that mirrors their natural diet - a refugium can provide a steady supply of live copepods if you want to cultivate them naturally. Feed small amounts once or twice daily. See our Firefish Feeding Guide.

Tankmates

Peaceful toward virtually all reef fish and invertebrates. Reef safe. Avoid large aggressive wrasses, triggers, and territorial dottybacks - a stressed firefish is a jumping firefish. Keep one per tank unless the system supports a mated pair. See our Firefish Tankmates guide.

Common Health Problems

Jumping: Leading cause of loss. A secure lid eliminates this risk.
Hiding and not eating: Normal in newly introduced fish - resolves within 1-2 weeks.
Marine ich: Quarantine all new fish for 4-6 weeks.
Aggression from tankmates: A chased firefish will jump.

See our Firefish Diseases guide.

Is a Firefish Right for You?

An excellent choice for beginner and intermediate reef keepers. Hardy, colorful, reef safe, peaceful, and does not require a large tank. The only non-negotiable requirement is a tight-fitting lid. If you can provide that and a stable, cycled reef tank of 20 gallons or more, a firefish is one of the most rewarding and low-maintenance marine fish you can keep.