Aquarium Requirements Minimum Tank Size: 40 gallons (150 litres) Temperature: 24–27°C (75–81°F) pH: 8.1–8.4 Specific Gravity (Salinity): 1.020–1.025 Alkalinity: 8–12 dKH Ammonia & Nitrite: 0 ppm Nitrate:< 10 ppm Aquascape: Provide a fine sandy substrate (3–5 inches) for burrowing and sifting, along with live rock for shelter and natural grazing surfaces Watchman Gobies thrive in established aquariums with stable water parameters and a sandy substrate that allows for their natural digging and feeding behaviors.Diet and FeedingWatchman Gobies are carnivorous sand sifters and feed primarily on small invertebrates found in the substrate: Frozen or live foods such as mysis shrimp, brine shrimp, and finely chopped seafood High-quality sinking pellets or marine flakes formulated for carnivorous fish Feed 2–3 times daily, ensuring food reaches the substrate where they naturally forage A varied diet supports strong coloration, vitality, and active behavior.Temperament and CompatibilityWatchman Gobies are peaceful, bottom-dwelling fish that coexist well with other non-aggressive species. They may become territorial toward similar gobies if kept in smaller tanks but generally remain calm in larger aquariums.Tankmate Recommendations: Suitable: Clownfish, blennies, firefish, small tangs, and other peaceful reef species Avoid: Large, aggressive, or predatory fish Providing sand for burrowing and plenty of hiding spots encourages natural behavior and reduces stress.Reef Compatibility✅ Reef SafeWatchman Gobies are reef safe and do not harm corals or sessile invertebrates. Their sand-sifting behavior also helps maintain a healthy, aerated substrate in reef aquariums.Additional Information Maximum Size: Up to 15 cm (6 inches) Lifespan: 5–7 years with proper care Difficulty Level: Easy to Moderate Natural Behavior: Peaceful, sand-sifter, bottom-dweller, may burrow under rocks for shelter Origin: Indo-Pacific, including Indonesia, the Philippines, and the Great Barrier Reef The Watchman Goby (Amblygobius phalaena) is a peaceful and practical addition to reef and community aquariums, offering both visual appeal and substrate maintenance. With stable water parameters, a sandy substrate, and a protein-rich diet, it thrives as a long-lived and engaging member of the marine aquarium community.