A pearly-white sleeper goby dappled with orange spots that constantly sifts mouthfuls of sand, keeping the substrate clean and oxygenated. Peaceful and reef-safe, it needs a mature, deep sand bed and frequent feeding to thrive.
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Indo-Pacific: from the Red Sea and East Africa to the western Pacific
Origin
Old World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Gobiidae
Genus
Valenciennea
Part of the Gobies
Small, mostly bottom-dwelling marine and brackish fish prized in aquaria for their hardiness, interesting behaviors, and roles such as sand-sifting, burrowing, or pairing with pistol shrimp. This grouping also includes goby-like specialty species sold under goby names.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Reef sand-sifter tank
55 gal / 208 L reef, deep sand
Valenciennea puellaris sifts sand constantly — needs a deep (3 in+) fine sand bed with mature pod populations. 55-gal reef minimum with stable rockwork (they undermine bases) and peaceful tankmates.
Photo coming soon
Recommended
Mature reef sifter
75 gal / 284 L mature reef
75-gal mature reef with deep fine sand bed, established pod culture, peaceful community, and supplemental feeding (often refuses prepared food). Pair if buying together as juveniles.
Photo coming soon
Ideal
Established display reef
100 gal+ / 379 L+ reef
Mature 100-gal+ reef with deep sand, refugium for pod production, varied feeding, and stable peaceful tankmates. Long-lived in well-tuned systems.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
Provide at least a 30-gallon tank with a deep, fine sand bed of 2 inches or more, which is essential for this dedicated sand-sifter to feed and dig burrows. They excavate tunnels under rocks, so anchor rockwork on the glass bottom or directly on a base so it cannot collapse when they dig beneath it. A tight-fitting lid is mandatory, as diamond gobies are notorious jumpers.
Keep stable reef parameters: temperature 72-79 F (22-26 C), pH 8.1-8.4, salinity 1.023-1.026 specific gravity, with low to moderate flow over the sand. Lighting is unimportant to the fish and can follow the needs of any corals present.
Substrate
A deep, fine aragonite or oolitic sand bed of at least 2 inches is essential; coarse gravel or bare-bottom tanks are unsuitable and prevent natural feeding. The substrate doubles as their foraging medium and burrow site.
Equipment & setup
Use a reliable heater, low to moderate flow that does not scour the sand bed, and a protein skimmer to handle the extra detritus they stir up. Reef lighting follows coral needs. Most important is a fully sealed lid or mesh top to stop jumping.
Diet
Carnivore that feeds by taking mouthfuls of sand, filtering out tiny invertebrates, worms, and crustaceans, and expelling the cleaned grains through its gills. This natural sifting rarely supplies enough food, so they must be supplemented with frozen mysis, brine shrimp, copepods, and sinking carnivore pellets fed two to three times daily.
A mature sand bed seeded with copepods and worms greatly improves their odds, especially right after import. Without enough supplemental food they slowly waste away, so consistent feeding is the key to long-term success.
Behavior & temperament
Peaceful and reef-safe with fish and corals, though their relentless sand-sifting can dust low-lying corals and clams, so place sensitive corals up on the rockwork. They are best kept singly or as a bonded male-female pair; two unpaired adults may fight in a small tank. They pose no threat to other fish and are easily bullied by aggressive tankmates.
Their constant earthmoving is both their charm and their maintenance value, turning over and aerating the substrate and exporting detritus. Expect rearranged sand, occasional buried snails, and sand sprayed onto nearby rocks.
Health
Susceptible to marine ich and velvet, and especially prone to starvation and slow wasting if the tank lacks live sand fauna and supplemental feeding. Look for a full-bodied fish that feeds eagerly before buying, as thin, sunken-bellied specimens rarely recover. Jumping is a major cause of loss, so a sealed lid is non-negotiable.
Quarantine and drip-acclimate new arrivals, and avoid combining them with food-competitive or aggressive fish. Stable parameters, a deep mature sand bed, and frequent feeding are the main preventives.
Tips, DIY & hacks
Add a diamond goby only to an established tank with a mature sand bed full of microfauna, then supplement heavily with meaty frozen foods so it never goes hungry. Anchor rock structures to the base glass before adding sand so the goby's burrowing cannot trigger a rock slide. They are an excellent natural way to keep a sand bed clean and oxygenated.
