Common fusegoby
Fusigobius neophytus
The Common fusegoby features a slender body, typically with a translucent to pale yellow hue and distinct dark markings along its dorsal fin.
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About the Common fusegoby
This is a tiny reef-associated sand goby that hangs out over sand and rubble patches near coral, usually solo or in loose little groups. Its semi-translucent gray body is peppered with fine spots and it blends in amazingly well, then you catch that little black spot on the first dorsal fin and go, oh there it is. In a tank it is all about having sand to perch on and plenty of calm, peaceful neighbors so it is not bullied.
Also known as
Quick Facts
Size
7.5 cm
Temperament
Peaceful
Difficulty
Intermediate
Min Tank Size
20 gallons
Lifespan
3-5 years
Origin
Indo-Pacific
Diet
Omnivore leaning carnivore - small benthic invertebrates/zooplankton; in aquaria small frozen foods (mysis, brine, Cyclops) and fine pellets
Water Parameters
21-30°C
8.1-8.4
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Calculate heater sizeCare Notes
- Give it a sandbed (fine sand) and some rubble or small rock piles - they like to perch and dive into cover when spooked.
- Run a tight lid or mesh screen; fusegobies can launch when startled, especially right after you add them.
- Keep salinity steady around 1.025-1.026 and avoid swings; they act fine until a big change, then they go off food fast.
- Feed small meaty stuff 1-2 times a day (mysis, brine, copepods, finely chopped shrimp); target feed with a pipette so bolder fish do not steal it all.
- Peaceful tankmates only - think small wrasses, cardinals, clownfish; skip aggressive dottybacks, big hawkfish, or anything that camps the bottom and bullies.
- They can get bullied out of food in busy reefs, so watch the belly line - if it starts looking pinched, up the frequency and spot-feed.
- If you keep more than one, add them together and provide multiple bolt-holes; mixing random adults later can turn into chasing in a small tank.
Compatibility
Good Tankmates
- Other chill sand-sifters that mind their own business - think small sleeper gobies and similar mellow gobies. Just give them enough sand and little caves so nobody feels like they have to fight over one spot.
- Watchman gobies (Cryptocentrus spp.), especially if you have a pistol shrimp setup. Different enough vibe that they usually ignore each other, and everybody stays down low doing their own thing.
- Small, peaceful wrasses like a pink-streaked wrasse or possum wrasse. They cruise the rockwork and water column and do not bully the sand gobies in my experience.
- Chill dartfish and firefish (Nemateleotris spp.). They hover up top, the fusegoby hangs near the sand, and they basically never even get in each other's face.
- Peaceful clowns (ocellaris/percula type) in a normal community setup. They can get a little spicy near their corner, but they usually do not go out of their way to mess with a bottom goby.
- Small, mellow reef fish like chromis or a calm flasher fairy wrasse - stuff that is active but not looking to throw punches. The fusegoby is peaceful and does best when the tank is not full of attitude.
Avoid
- Dottybacks and pseudochromis - they love picking on timid fish and will absolutely hassle a peaceful goby that just wants to perch and eat.
- Damselfish with a mean streak (most of them, honestly) - once they claim a patch of rock, they will chase anything that comes near, including a fusegoby that is just passing by on the sand.
- Hawkfish - they are not always murder machines, but they are pushy perch-and-pounce types and can harass small gobies or outcompete them hard at feeding time.
- Big, boisterous predators or bullies like larger wrasses, groupers, and aggressive triggers - if it can fit a goby in its mouth or slam it around for fun, it is a no-go.
Where they come from
Common fusegobies (Fusigobius neophytus) are little sand-loving gobies you run into on shallow Indo-Pacific reef flats and lagoons. Think rubble zones and open sand near patches of rock, where they can dash for cover fast.
In the tank they keep that same vibe: perch, hover, hop, and retreat. If you give them the right bottom and a few bolt-holes, they settle in and become a surprisingly entertaining "background" fish you end up watching all the time.
Setting up their tank
Build the tank around the sandbed. This is a goby that wants open sand to sit on and sift around, plus nearby rockwork or rubble to zip into when something spooks it.
- Tank size: I would start at 20-30 gallons for one, bigger if you want a small group or a more active community
- Substrate: fine sand is your friend (coarse gravel can scratch them and just looks wrong for their behavior)
- Rockwork: make a few low caves and crevices right at the sand line so they can duck in without having to climb
- Flow: moderate is fine, but keep at least one calmer area where food can settle and the goby can hover without fighting the current
- Lighting: whatever suits your reef, they do not care as long as there is cover and a decent day-night rhythm
They can jump. If there is a gap in your lid, they will eventually find it. A tight cover or mesh top saves you the worst kind of "where did my goby go?" day.
I like adding a little rubble pile (small chunks of rock) on one side of the sandbed. It gives them a "home base" and also creates micro-shaded spots where pods hang out, which helps with natural grazing.
What to feed them
Fusegobies are small-mouthed micro-predators. Mine have done best with frequent, small meaty foods rather than one big feeding. If you feed the whole tank once a day and call it good, this fish can slowly lose weight even though it looks like it is eating.
- Frozen: mysis (smaller pieces), brine shrimp (enriched), finely chopped krill or seafood mixes, calanus, cyclops
- Live (great for new or shy fish): baby brine, copepods, live blackworms (rinse well and use sparingly in marine)
- Dry: small sinking pellets and tiny granules can work once they recognize it as food
Target feeding helps a lot. Use a turkey baster or pipette and squirt a small cloud of food near the sand in front of them. They are not built to win a midwater feeding frenzy.
Watch their belly. A healthy fusegoby looks a bit rounded through the abdomen after meals. If it is looking pinched for days, bump up feeding frequency and make sure faster fish are not stealing everything.
How they behave and who they get along with
Temperament is generally peaceful. They spend most of their time on or just above the sand, doing little darts and short hovers. They are not a "centerpiece" fish, but they add a lot of life to the lower half of the tank.
Tankmates that work well are other calm reef fish that do not treat the sandbed like a battleground. I have had the best luck pairing them with peaceful wrasses (the smaller, gentler types), firefish, small chromis, and non-bully clownfish.
- Good picks: peaceful reef fish, cleaner shrimp, snails, most small hermits (watch any extra feisty ones)
- Use caution: very boisterous feeding competitors (bigger wrasses, large clowns), sand-stirring fish that constantly blast the bottom
- Avoid: aggressive dottybacks, large hawkfish, big predatory wrasses, anything that thinks "tiny goby" is a snack
They do not always pair with pistol shrimp like some watchman gobies do. You might see them share a general area, but I would not buy this species expecting a guaranteed shrimp partnership.
Breeding tips
Breeding in home tanks is possible with a compatible pair, but it is not as "set it and forget it" as clownfish. They are cave/spawn-site oriented and the larvae are tiny and planktonic, which makes raising babies the hard part.
- Give them choices: small caves, tight crevices, and rubble pockets right on the sand
- Condition with food: multiple small feedings of meaty foods (and some live foods if you can) helps bring out spawning behavior
- If you actually want to raise larvae: plan on a dedicated larval setup with gentle air, live phytoplankton, and rotifers first, then step up to larger foods as they grow
If you notice one fish guarding a little hole and chasing others away, do not redecorate that week. Let them keep their spot. Messing with rockwork can shut the whole thing down.
Common problems to watch for
Most issues I have seen come down to two things: getting outcompeted at feeding time, and stress from too much chaos around the sandbed. They are tough enough once settled, but they can look "fine" while slowly wasting away if they are not getting enough food.
- Jumping: the number one preventable loss - cover the tank
- Getting skinny: increase feeding frequency, target feed, and reduce competition at mealtime
- Hiding constantly: usually tankmate pressure or not enough sand-level shelters
- White spots and flashing: classic marine ich symptoms - quarantine new arrivals if you can, and do not ignore early signs
- Rapid breathing after introduction: check oxygen and ammonia first, then look at aggression and flow blasting their resting area
Avoid "sandbed nukes" like stirring deep, dirty sand all at once. These gobies live on the bottom and are the first to suffer if you dump a bunch of nasties into the water column.
If you give them a calm sand zone, a lid, and a steady supply of small meaty foods, they are a really enjoyable fish. Not flashy, but the kind you miss immediately when it is not there.
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