Yellow Watchman with Pistol Shrimp Pair

Yellow Watchman Goby 1.5 - 2" (Cryptocentrus cinctus)

Appearance & Behavior

Yellow to grayish coloration is sprinkled with small blue markings. It often rests at a burrow entrance, keeping watch over nearby activity. Observe its feeding and retreat behavior as it settles in rather than expecting constant open-water swimming.

Quick Care Guide

• Care level: easy to moderate once feeding reliably in a stable aquarium.
• Temperament: generally peaceful toward dissimilar fish; territorial disputes may occur with similar bottom dwellers.
• Adult size: approximately 4 inches.
• Minimum aquarium: 30 gallons, with a footprint and shelter suited to adult needs.
• Diet: carnivore; suitably sized marine animal foods.
• Reef compatibility: generally reef-safe with corals and most typical ornamental invertebrates.
• 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 fine sand with some suitable rubble beside secure rockwork for a burrow. Compatible pistol shrimp may share the shelter, but a shrimp is not required for the goby to survive and pairing is not automatic. 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

Most typical ornamental reef invertebrates are suitable companions, but tiny crustaceans and larvae may be eaten. Assess predators and aggressive shrimp separately rather than treating every invertebrate as safe.

Feeding

Offer appropriately sized frozen mysis, enriched brine shrimp, copepods, and fine marine pellets or flakes as accepted. Place food close to its retreat so faster tankmates do not take every meal.

Provide small meals twice 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.

Existing listing resources: pistol shrimp and hatchery diet.. Match food size to the individual and confirm acceptance.

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.