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FishbeginnerSaltwater

Yellow Watchman Goby

Cryptocentrus cinctus

AnimaliaChordataActinopterygiiGobiidae

📍 Indo-Pacific sandy reef flats

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Vibrant yellow with blue spots, best known for its mutualistic relationship with pistol shrimp — the shrimp digs and maintains a shared burrow while the goby stands guard. A staple of any reef tank.

Size3.5"
Min Tank30g
peaceful
Zonebottom

Care Guide

Diet

Yellow Watchman Gobies are carnivorous and thrive on a diet of small frozen foods including mysis shrimp, brine shrimp, and copepods. High-quality marine pellets formulated for small carnivores should be offered daily. Feed small portions once daily, adjusting quantity based on appetite and tank bioload.

Behavior

This goby is a bottom-dweller that spends much of its time hovering near its burrow, darting in and out to feed and survey its territory. They are peaceful and non-aggressive toward other fish, though they may be territorial with other gobies. The species is famous for its mutualistic symbiosis with pistol shrimp, which excavate and maintain a shared burrow while the goby stands guard.

Breeding

Breeding Yellow Watchman Gobies in captivity is extremely rare and difficult, with very few documented successes in home aquariums. They require specific environmental triggers and pair bonding that are challenging to replicate. Most specimens in the hobby are wild-caught, and captive breeding is not a practical goal for hobbyists.

Common Diseases

Ich (Marine Ich)

Symptoms

White spots on body and fins, rapid breathing, flashing against rocks, lethargy

Treatment

Raise temperature gradually to 28-29°C, maintain excellent water quality, use copper-based treatments or hyposalinity therapy; quarantine if possible

Bacterial Infections

Symptoms

Torn fins, cloudy eyes, open sores, discoloration, loss of appetite

Treatment

Improve water quality immediately, perform frequent water changes, use antibiotic medications if severe; ensure adequate nutrition

Parasitic Infections

Symptoms

Excessive scratching, visible parasites, weight loss, labored breathing

Treatment

Quarantine affected fish, treat with appropriate antiparasitic medication, maintain pristine water conditions

Fin Rot

Symptoms

Frayed or deteriorating fins, discoloration at fin edges, progressive fin loss

Treatment

Perform large water changes, improve water quality, treat with antibacterial medication if bacterial; ensure adequate nutrition

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Quick Facts

pH
8.1–8.4
diet
carnivore — mysis, pellets
maxSize
4 inches
minTankSize
10 gallons
temperature
75–82°F (24–28°C)

Temperature

75–82°F

24–28°C

Stats

Community tips0
Kept by0 hobbyists