Ward's goby
Valenciennea wardii
The Tiger Sleeper Goby commands attention with bold brown vertical bands and a distinct dorsal eyespot. It is a robust, peaceful bottom-dweller that aggressively turns over sand for embedded microfauna.
Water Temperature
22 - 27 °C
pH Value
8.1 - 8.4
Water type
Marine
Tank level
Bottom
Adult size
12 cm
Minimum tank volume
>= 150 L
Minimum group
>= 1
KH
8 - 12 dKH
Species description
Geographical Origin and Habitat: Indo-West Pacific: widely distributed from the Red Sea and East Africa to Indonesia, the Philippines, and the Great Barrier Reef. It inhabits deep sandy substrates in protected bays, coastal lagoons, and reef slopes at depths of 5 to 30 meters.
Taxonomy and Morphology: Member of the Gobiidae family, genus Valenciennea. It features a robust, cylindrical body with a large head. Equipped with a wide mouth positioned low to scoop and sift sand for benthic organisms. Grows up to 12 cm (4.7 inches) in length.
Social Behavior: Peaceful sand-sifter that typically lives in stable, monogamous pairs. They construct burrows beneath rocks. Shows strong territorial defense against conspecifics and other bottom-dwellers with similar ecological niches.
Coloration and Sexual Dimorphism: Features a greyish-white body adorned with 3-4 broad vertical dark brown bands. The first dorsal fin is decorated with a prominent black ocellus outlined in white. Cheeks have striking iridescent blue stripes. No obvious sexual dimorphism.
Care, breeding and tankmates
Aquarium Setup: Minimum tank size of 150 liters (approx. 40 gallons) with a tight cover. Requires a 5-8 cm deep bed of fine, soft sand. Ensure that all rockwork is seated directly on the bottom glass to prevent collapses due to their digging habits.
Diet and Feeding: Carnivorous sand-sifter. It feeds on micro-crustaceans and worms in the sand. In the aquarium, target-feed frozen mysis, brine shrimp, and sinking pellets several times daily to maintain body weight, as they have a high metabolism.
Water Quality: Keep standard marine parameters stable: temperature 22-27°C (72-81°F), pH 8.1-8.4, specific gravity 1.020-1.025, and KH 8-12. Efficient mechanical filtration and protein skimming are required because they stir up fine sand particles.
Compatibility and Cohabitation: Peaceful with open-water fish and fully reef safe. However, they may drop sand on low-lying corals. Do not mix with other Valenciennea species or competitors unless they are a mated pair. Keep with peaceful tankmates.
Aquarium Breeding: Spawns in pairs inside sandy burrows, where adhesive eggs are attached to rock surfaces and guarded by the male. Raising pelagic larvae in home aquariums is highly challenging due to their tiny size and requirement for live micro-rotifers.
Risks and Diseases: High risk of starvation in new aquariums with sterile sand. They are prone to wasting away if not fed multiple times a day. They are also prone to jumping out of the tank when startled, so a secure cover is necessary.
Geographic Origin and Distribution
Indo-West Pacific: widely distributed from the Red Sea and East Africa to Indonesia, the Philippines, and the Great Barrier Reef. It inhabits deep sandy substrates in protected bays, coastal lagoons, and reef slopes at depths of 5 to 30 meters.
Origin
Tropical oceans and reefsAfrica and MadagascarSouth and Southeast AsiaAustralia, New Guinea, and Oceania
Fish profile
- Temperament
- Semi-aggressive
- Overall, it has a timid and peaceful temperament toward completely different fish species. It tends to ignore other tank inhabitants, focusing entirely on its sand-sifting duties. It can be easily intimidated by aggressive or hyperactive tank mates, which may cause it to hide and refuse food. A calm environment allows its natural, industrious behavior to shine.
- Diet
- Carnivore
- This species is a carnivorous sand-sifter that relies heavily on benthic microfauna. It constantly scoops mouthfuls of sand, sifting out small crustaceans, worms, and organic matter through its gills. While they will accept prepared frozen foods like mysis and brine shrimp, a mature sandbed teeming with copepods is essential for long-term survival. Supplementary feeding multiple times a day may be required if the tank lacks sufficient natural food.
- Life expectancy
- 5-8 years
- Under optimal care, Ward's Goby has a typical lifespan of 5 to 8 years in captivity, which is relatively long for a goby. Ensuring a stress-free environment, stable water parameters, and an abundant food supply is crucial to achieving this longevity. Providing a deep, mature sand bed rich in microfauna is the single most important factor in preventing premature decline. Regular tank maintenance and peaceful tank mates also support their overall health and vitality.
- Adult size
- 12 cm
- The catalog's scalar value is 12 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 15 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Valenciennea wardii (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Flexible
- They are best kept individually or in confirmed male-female pairs. Two males will inevitably fight, often to the death, over territory in the same tank. Pairing them can be tricky since they are not strongly sexually dimorphic. Acquiring an established pair from a reputable source is the safest way to house two individuals together.
- Feeding frequency
- 3-4 times daily
- Due to their active metabolism and constant foraging, these gobies need to feed frequently. They should be offered small amounts of food at least two to three times daily if the natural microfauna is limited. A well-established refugium can help supply a continuous source of pods. Without adequate feedings, they are prone to slowly starving in captivity.
- Bioload
- This marine goby has a relatively low bioload compared to larger predatory fish. Its constant sand-sifting behavior actually helps process detritus and uneaten food in the substrate. Maintaining a healthy sandbed is crucial for biological filtration with this species. Therefore, a mature aquarium with a deep sand bed will easily handle the minimal waste it produces.
- Flow
- Moderate
- These gobies appreciate moderate to gentle water flow that does not disturb the sandbed excessively. High, sweeping currents can blow away their carefully constructed burrows and strip the sand of organic matter. A steady but diffused flow helps oxygenate the water while keeping their benthic environment stable. Ensuring lower flow near the bottom of the tank is highly recommended.
- Jump risk
- Yes
- Like most gobies, this species is notorious for its jumping abilities, especially when startled. They can easily launch themselves out of an open-top aquarium or through small gaps in the lid. A tight-fitting lid or fine mesh screen is absolutely mandatory to prevent tragedy. Extra caution should be taken during the first few weeks of acclimation when they are most skittish.
- Reproduction
- Oviparous
- Breeding in captivity is possible but rearing the fry is extremely challenging. They are demersal spawners, typically laying their adhesive eggs on the ceiling of a burrow or a protected cave. The male guards and aerates the clutch until they hatch into pelagic larvae. Because the larvae are microscopic and require specialized rotifer diets, few successfully raise them in home aquariums.
- Compatibility & tankmates
- Peaceful
- It is generally peaceful and reef-safe, ignoring corals and most other fish. However, it can be fiercely territorial toward other sand-sifting gobies or fish with a similar body shape. Keeping them in established male-female pairs is recommended to avoid conspecific aggression. They make excellent tank mates for quiet, non-aggressive species.
- Tank level
- Bottom
- This fish is almost exclusively a bottom-dweller, spending its day hovering just above the substrate. It continuously interacts with the sandbed, digging and sifting to find food. It will construct a burrow under liverock, where it retreats when threatened and sleeps at night. Providing plenty of open sandy areas and secure rockwork is essential.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.2 ± 0.3 se
- Resilience
- Medium (1.4 - 4.4 years)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.00741, b = 3.09
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
