Also Known As: Yellow Prawn Goby, Yellow Shrimp Goby
Compatibility and Behavior
The Yellow Watchman Goby (Cryptocentrus cinctus) is a stout, bright golden-yellow fish dusted with small pale-blue spots, with a characteristically big head and upward-facing eyes that give it an endearing, watchful look. (Juveniles can come through steel-blue before they color up to adult yellow, so don't be thrown if a young one looks nothing like the photo.) True to its name, it spends the day perched at its burrow entrance scanning for trouble and ducking inside at the slightest disturbance, though it quickly learns to recognize its keeper and grows bolder at feeding time. It's fully reef safe and peaceful toward most tankmates, an easy pick for a community reef. The real draw is the shrimp-goby partnership: this is one of the hobby's favorite examples, forming a symbiotic bond with a pistol shrimp (we recommend the Tiger Pistol Shrimp) where the nearly blind shrimp digs and maintains a shared burrow while the sharp-eyed goby stands sentinel, warning its partner of danger with subtle flicks of its tail. A pistol shrimp isn't required for the goby to thrive, but the pairing is natural and a genuine pleasure to watch. It can get territorial toward other Watchman Gobies or similar bottom dwellers, so it's best to keep just one shrimp goby species per tank in most setups.
Aquarium Requirements
Substrate and a lid are the two essentials. This is a burrower, so it needs a sand bed of at least 2 to 3 inches, ideally a mix of fine to medium sand with small rubble or shell fragments to help support a stable burrow, especially if it pairs with a pistol shrimp. A secure, tight-fitting lid is a must, since this is a well-known jumper, particularly when startled or newly introduced. One structural note tied to the burrowing: set your rockwork firmly on the tank bottom rather than resting it on the sand, since digging can otherwise shift or collapse loose rock. Beyond that it's an easy fish, happy in a tank of at least 10 to 20 gallons with moderate flow, though it's best not to aim that flow straight at the sand bed, which can destabilize the burrow entrance and make it harder for the goby to perch. Keep it well fed with mysis, enriched brine, cyclops, and finely chopped seafood.
Specifications
Approximate Size: Md: 1–1.75", Lg: 2–2.5"
Diet: Carnivore; mysis shrimp, enriched brine shrimp, cyclops, and finely chopped seafood
Origin: Indo-Pacific
Care Level: Easy
Reef Safe: Yes
Temperament: Peaceful
Minimum Tank Size: 10 gallons
Special Considerations: Needs a sand bed of at least 2–3 inches with rubble for burrowing; a well-known jumper that needs a tight-fitting lid; seat rockwork on the tank bottom rather than the sand, as burrowing can shift loose rock; forms a beneficial partnership with a pistol shrimp, but may be territorial toward other shrimp gobies, so keep just one shrimp goby species per tank