White Sleeper Goby

White Sleeper Goby (Valenciennea sexguttata)

Appearance & Behavior

A pale body and blue facial spots give this sand-sifting sleeper a subtle appearance. Observe its feeding and retreat behavior as it settles in rather than expecting constant open-water swimming.

Quick Care Guide

• Care level: moderate to advanced; a mature feeding environment is important.
• Temperament: generally peaceful toward dissimilar fish; territorial disputes may occur with similar bottom dwellers.
• Adult size: approximately 6 inches.
• Minimum aquarium: 75 gallons, with a footprint and shelter suited to adult needs; volume alone does not guarantee an adequate food supply.
• Diet: carnivore; suitably sized marine animal foods.
• Reef compatibility: generally safe with coral tissue, but digging and sand deposition can disturb corals.
• Temperature: 72–78°F.
• Specific gravity: approximately 1.023–1.025; maintain stable salinity appropriate for all inhabitants.
• pH: 8.1–8.4.
• Alkalinity: 8–12 dKH; prioritize stability and the needs of the aquarium.

Aquarium Setup & Compatibility

Provide a broad area of mature fine sand and established grazing surfaces. Avoid sharp or coarse substrate. Repeated sand processing can deplete small prey; substrate activity does not prove adequate nutrition. Use a fully cycled, stable aquarium with effective filtration, good oxygenation, and regular maintenance. Support structural rock independently of loose sand.

A tightly fitted lid is essential. Cover gaps around plumbing and cables, protect overflow access, and take jump precautions during acclimation and transfers. Choose calm companions that cannot swallow the goby and will not prevent feeding. Avoid aggressive bottom-territory competitors and persistent fin nippers.

One individual or a known compatible pair is the safest starting point for most small setups. Two unfamiliar gobies are not automatically a pair; provide separate retreats and monitor chasing. Separate animals if persistent aggression causes injury or exclusion from food.

Reef & Invertebrate Compatibility

Sand movement can cover low-placed coral tissue and destabilize unsecured frags. Keep vulnerable corals away from active excavation and feeding areas, and clear unwanted deposits carefully.

Feeding

Offer small sinking meaty marine foods near its feeding area, such as appropriately sized mysis, copepods, and finely chopped seafood. Confirm swallowing before purchase, and sustain suitable natural prey as needed. Do not rely on a clean-looking sand bed as evidence that it is well fed.

Provide small meals two or three times daily, adjusting for size and condition. Confirm every fish swallows food. Monitor belly fullness: a thinning body or hollow abdomen needs attention even if the goby is actively picking or sifting. Remove leftovers promptly to maintain water quality.

Introduction & Long-Term Care

Plan quarantine with secure covers, appropriate shelter, and a dependable feeding method. Acclimate to temperature and salinity, reduce lighting during introduction, and give immediate access to a retreat. Avoid repeated chasing and abrupt changes in water conditions.

Monitor appetite, breathing, body condition, and interactions daily. Persistent hiding with missed meals, weight loss, or damaged fins calls for attention to food delivery and compatibility. Maintain adult-sized housing and arrange reliable feeding during time away.