Saltwater Aquarium Blog

quick facts, care guide, diet and more –

You will probably agree with me that the saltwater firefish goby, Nemateleotris magnifica, is a gorgeous saltwater fish, right? It is inexpensive, commonly available in the trade and might be at your local fish store right now. If you’re thinking about adding one to your reef tank, check out the rest of this article to see what it takes to care for the stunning firefish goby.

It is a relatively hardy species, non-aggressive species that is easy to keep alive with proper care, making it great for the hobbyist of all levels.

See how the firefish goby gets its name

The fire goby is absolutely stunning to look at. The brilliant red, orange, and yellow and white coloring on their bodies stand out, even among reef fish, which is undoubtedly where it gets its name and is at least half of the reason they are so popular.

firefish goby

Looking at this fish, there’s no surprise how it got the name firefish goby

Quick facts:

  • Scientific Name: Nemateleotris magnifica
  • Common Names: Firefish goby, fire goby, fire dartfish, magnificent dartfish
  • Size: About 2-3 inches
  • Minimum tank Size: 29 gallons
  • Aggression Level: Docile
  • Care Level: Minimum Difficulty
  • Most Active: Day
  • Lifespan: About 3 years
  • Endangered status: Least concern

The natural habitat of Nemateleotris magnifica

Naturally found in reef environments located in both the Pacific and Indian oceans, Nemateleotris magnifica can be found swimming at depths from about 20 to 200+ feet in the reefs around Hawaii and some areas of Africa. The firefish often face against the current to let prey naturally come to them instead of hunting like many other species of fish.

The Nemateleotris magnifica is currently not in endangered and prefers to live alone after reaching adulthood. Once the firefish goby has found a mate, they will live together in pairs. Most commonly this fish can be found in sand burrows, especially when a threat is near. To communicate in the wild, the firefish uses its dorsal fin to alert other of potential danger. I’ve never observed it in the wild, but it sure is fun to watch in your tank.

Proper aquarium care, conditions & behavior for the fire goby

Caring for the fire goby in your saltwater aquarium is going to be fairly straightforward, by traditional reef aquarium standards. Since this is a small fish, it doesn’t require a large tank. Anything in the 29+ gallon range should be sufficient.

Standard reef aquarium water parameters are appropriate

The fire goby is notorious for being a gorgeous, peaceful and calm reef fish for a community tank when mixed with other species, but is highly aggressive most times, when kept with others of the same or similar species.

A few people have reported that they seem to prefer moderate to slow-moving parts of the tank, rather than the areas of greatest current, so you might want to think twice about adding them to your tank if you have powerful currents (for example, with certain branching SPS corals as the dominant species).

firefish goby number 1 care guide tip

The most important advice is to make sure you have a tight-fitting lid on your aquarium or netting around the edges because while the fire goby has a life expectancy of about 3 years, most are cut way short because they have a bad habit of jumping out of tanks. Jumping becomes even riskier when the species becomes stressed or feels threatened.

  • To safely house the Nemateleotris magnifica, you must have a secure lid on your tank at all times.
  • To keep stress low, you need to provide plenty of hiding spots for the firefish.
  • In the wild, the firefish does enjoy sand burrows. Try using a sand substrate in your tank that is deep enough for this fish to burrow into.

Depending on how you have designed and aquascaped or decorated your saltwater aquarium, a simple short section of PVC pipe is a great spot for the fire goby to hide.

Missing fish?

It is not uncommon for a newly introduced fire goby to spend a significant amount of time hiding in the rocks–so if your firefish has disappeared for a while–check the floors immediately–as long as they haven’t started surfing the carpet, you can breathe a little easier that they may just be hiding in the rockwork. If that’s the case, they’ll come back out when they feel secure.

Fire dartfish compatibility

The fire dartfish is a peaceful species of community fish that will generally mix well with other non-aggressive fish. Use caution when adding them late to an established reef tank, if your tank already has fish that are defining territories. This mild-mannered dartfish may become the victim of fish aggression and bullying if they are added too late in the pecking order.

That is what happened to the last one that I added to my tank. I have a pair of clownfishes who have decided all 92 gallons are there (in a radius that extends out from their flower pot).

They were not big fans of the fire dartfish at all, and they let him or her know it every few minutes until separated.

However, this magnificent creature will co-exist nicely with other mild-mannered fish.

Personal observation on pairing

I don’t recommend placing more than a single dartfish in the tank unless you have a lot of time to monitor and separate the two if aggression arises. A few years back I was unsuccessful in trying to establish a pair. There was a lot of aggression/territoriality.

fire goby

Establishing a pair can be challenging with the fire goby, due to aggression

While it is possible to pair them up of the species in a tank. While this fish can form pairings in opposite sex-groups, they are generally territorial to each other. Territorial actions get even worse when placed in a minimum sized tank where the fish can’t freely swim without bumping into one another. Juvenile firefish will often be seen swimming in groups, but once adulthood is reached, chances are high, these fish will begin to quarl.

Commonly placed in reef communities with the firefish goby are clownfish, shrimp, and other small goby. This fish can be a great asset if you have other shy fish breeds in your tank. Firefish are labeled as “dithers,” meaning that they help other fish come out of their shells. This breed of fish won’t eat on plants or disturb invertebrates in your tank.

Breeding Nemateleotris magnifica in captivity

Sadly, the firefish goby is a hard fish to sex. There are no telling signs of whether a firefish goby is either male or female. If two firefish do make a pairing, it’s safe to assume they are of the opposite sex. Breeding is a bit of a mystery with this breed as well. Due to their shy nature, it’s been hard to observe the firefish’s breeding patterns. Both in the wild and in captivity little is known about the species mating ritual. We do know that this species of fish is an egglayer. Many studies assume that it has similar mating patterns to other goby.

Diet and feeding

The firefish goby is a planktivore, meaning it naturally adapted to eat floating, prey suspended in the water column. So they do well when fed meaty foods like live black worms, mysid shrimp, brine shrimp, or other seafood preparations (Michael 2001).

Where To Buy

The marine firefish goby can be found in many pet shops around the world. This includes many online pet shops. A single firefish goby usually costs no more than $10-15.

Conclusion: Who should and should not add a firefish goby to their saltwater aquarium?

Who should consider adding a firefish goby to their saltwater tank?

  • Anyone who wants a gorgeous, slender and shy fish–as long as you don’t have any semi-aggressive or aggressive bullies in the tank.

Who should not add a firefish goby to their tank?

  • Anyone with aggressive or territorial fish
  • Even those with mild-mannered community fish but with tanks that lack a proper way of preventing the fish from jumping (like a lid or mesh netting)
  • If you already have a dartfish in your tank
  • If your tank is less than 3 months old

Want to learn more about other similar saltwater fish?

If you want to learn more about similar saltwater fish species, check out a few of these other amazing saltwater fish:

Looking for something totally different, instead?

If you’ve seen enough and want to learn about a different type of saltwater fish, check out a few of these options:


ICUN Redlist status

Michael, Scott. Marine Fishes: 500+ Essential-to-know aquarium species. TFH Publications 2001.

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