Gobies · Gobiidae
Care levelIntermediate
Diamond Watchman Goby
Valenciennea puellaris
A white sand-sifting goby patterned with orange spots and dashes. It needs a productive sand bed plus reliable supplemental feeding; a clean-looking substrate does not demonstrate that the fish is getting enough food.
Sand-sifting fish can lose condition despite appearing active. Maintaining nutrition and suitable substrate is more demanding than buying a clean-up fish.
Recommendation
Would you recommend this fish for a suitable saltwater aquarium?
30+ galRecommended tank
6 inchesAdult size
Peaceful; territorial with similar gobiesTemperament
With cautionCoral safety
+ Why you’ll love them
- Interesting natural sand-foraging behavior.
- Suitable prepared foods can support a dependable feeding plan.
- Generally peaceful toward appropriately chosen dissimilar fish.
! Things to consider
- Can lose condition without a productive habitat and supplemental feeding.
- Similar gobies can dispute shelter or territory.
- Needs secure cover and a suitable adult habitat.
Tank and habitat
- Recommended volume
- 30 US gallons or larger; allow for stocking and layout.
- Full-grown size
- 6 inches (maximum adult size)
- Tank footprint and swimming space
- Provide a generous area of accessible fine sand, low shelters and room for an adult to feed. Do not equate a tall narrow tank with sufficient substrate area.
- Tank maturity
-
6 months recommended
Use an established productive sand bed and mature filtration. Six months is editorial planning guidance, not proof of a self-sustaining food supply; confirm supplemental feeding. Suggested tank age is a planning guide, not proof of readiness. Complete cycling, stable water and the right food supply are essential. - Habitat and equipment
- Support rockwork securely before excavation, protect pump intakes and close lid gaps. Consider a mature refugium as a supplement to feeding and manage displaced sand.
Care and compatibility
- Temperament
- Peaceful; territorial with similar gobies
- Why this care level
- Sand-sifting fish can lose condition despite appearing active. Maintaining nutrition and suitable substrate is more demanding than buying a clean-up fish.
- Suitable tank mates and conflicts
- Choose peaceful fish that cannot swallow this goby. Avoid persistent harassers, predatory basses and aggressive bottom dwellers; ensure every fish can reach food.
- Alone, pair or group
- One individual or a verified compatible pair is the simpler plan. Similar sand sifters can compete for territory and limited substrate food.
Corals and invertebrates
- Coral safety
-
With caution
With caution: usually leaves coral tissue alone, but displaced sand may smother low corals. Keep vulnerable colonies away from depositing areas. - Shrimp safety
-
With caution
Generally compatible with established ornamental shrimp, but tiny shrimp and larvae may be eaten. Predatory crustaceans can threaten the goby. - Snail safety
-
Generally compatible
Generally compatible with established snails; tiny larvae and small food organisms may be eaten. - Clam safety
-
With caution
With caution: falling or shifted sand can disturb or bury low-placed clams even without mantle picking.
Food and feeding
- Diet
- Carnivore; suitable small marine meaty foods
- Feeding plan
- Provide frequent small marine meaty meals and ensure they are eaten. A sand bed and refugium supplement, rather than replace, a proven feeding routine; monitor belly fullness.
- Prepared or live food
- Offer appropriate frozen mysis and other marine carnivore foods near the bottom. Require demonstrated prepared-food acceptance and watch for weight loss.
Water conditions
- Temperature
- 72–78 °F (22–26 °C) is the marine aquarium reference range used here. Maintain stable conditions and consider all inhabitants.
- Specific gravity
- Specific gravity 1.020–1.025 is a common fish-care reference range. Corals and other invertebrates may require a narrower target.
- pH
- pH 8.1–8.4. Maintain stability and monitor alkalinity instead of making abrupt corrections.
Long-term care
- Lifespan
- The references used here do not establish a dependable typical captive lifespan. Plan for long-term care without assuming an invented average.
- Growth and future planning
- Published aquarium guidance lists up to about 6 inches. Plan for adult shelter and feeding needs rather than the juvenile’s purchase size.
Before you buy
- Is this fish right for your tank?
- Provide an established fine-sand area and confirm it takes offered food. Watch belly fullness and body weight; do not buy solely to clean an immature sand bed.
- Buying checklist
- Check the scientific name, observe feeding and inspect the eyes, fins, breathing and body condition. Arrange quarantine and confirm the seller’s feeding and acclimation routine.
User comments (0)