Description
Diamond Watchman Goby (Valenciennea puellaris)
The Valenciennea puellaris, known as the Orange-Spotted Sleeper Goby or Maiden Goby, is a highly active and beneficial sand-sifting fish. They are widely appreciated for their ability to keep aquarium sand beds clean and turned over, though they require specific care to remain healthy.
- Temperament: Generally peaceful, though they can be territorial toward their own species or other sand-sifting gobies.
- Size: Grows to approximately 15–18 cm.
- Key Trait: They constantly scoop mouthfuls of sand, sifting it through their gills to extract micro-organisms and detritus, which helps maintain substrate health.
- Behavior: Often seen swimming in pairs; they are prone to jumping and require a secure, tight-fitting lid.
Care Requirements
- Tank Size: Minimum 50 gallons is recommended. They require a significant amount of sand-bed surface area to find enough food.
- Temperature: 22–26°C.
- Salinity: 1.020–1.025 SG.
- pH: 8.1–8.4.
- Environment: A deep, fine-grained sand bed (at least 5-7cm deep) is mandatory. They also require plenty of live rock to create burrows for sleeping and hiding.
- Lighting: No specific requirements, though they are more comfortable in tanks with moderate lighting.
Maintenance
- Water Quality: Standard reef parameters. Keep nitrates low to prevent nuisance algae blooms that can be exacerbated by excessive sand-sifting.
- Routine: Regular water changes and good mechanical filtration are important, as these fish move a significant amount of sediment into the water column.
- Caution: Ensure all rockwork is placed directly on the bottom glass or securely supported, as these gobies will undermine unstable rock structures while digging their burrows.
Diet
- Type: Carnivore/Planktivore (Sand-sifter).
- Staples: In the aquarium, they need a steady supply of live or frozen foods. Offer Mysis shrimp, brine shrimp, finely chopped seafood, and high-quality sinking pellets.
- Challenge: They often suffer from malnutrition in newer tanks where the sand bed has not yet developed enough natural micro-fauna. It is common for them to slowly starve if not supplemented with frequent feedings.
Behavior and Compatibility
- Tankmates: Compatible with most peaceful community fish. Avoid aggressive species that might outcompete them for food or stress them.
- Social: Best kept singly unless you have a mated pair or a very large tank. They will fight with other Valenciennea species.
- Reef Safety: Generally reef-safe; however, they can be “messy” neighbors. As they sift, they often drop sand over low-lying corals (like zoanthids or Acropora frags), which can irritate or kill sensitive specimens.
Reproduction
- They are known to form long-term monogamous pairs.
- Spawning involves the pair cleaning a burrow entrance and depositing eggs inside.
- Captivity: Rearing the fry is extremely difficult due to the specialized needs of the planktonic larvae. Most home aquarists will not see successful reproduction in a standard community tank.
Tips
- Sand Bed: If your tank lacks a deep sand bed, this species is not a good choice.
- Supplement Feeding: Do not rely on them to “clean” your tank; they must be targeted fed until they are actively eating prepared foods.
- Jump Risk: Like many gobies, they are talented jumpers. A lid is essential.
- Rock Stability: Always secure your rockwork to prevent the “landslides” they cause while digging.
Picture for illustrative purposes only. Either come in store to view available stock or request pictures to be sent to you.
Please Note: Due to variations within species resulting from age, region, sex, etc., the actual livestock may not look identical to the image. Approximate size range may also vary between individual specimens.
